| P12686 | category for births in this time period | ... | Q6301055 (Category:21st-century births) | Category:21st-century births |
| P12687 | category for deaths in this time period | ... | Q7055925 (Category:21st-century deaths) | Category:21st-century deaths |
| P373 | Commons category | String | 21st century | ??? |
| P1889 | different from | ... | Q205487 (21st century BC) | 21st century BC |
| P582 | end time | ... | 2100-12-31 | ??? |
| P2888 | exact match | Url | 21e siècle | Liste d'autorité Contexte historique pour l'indexation des archives locales | ??? |
| P156 | followed by | ... | Q11177 (22nd century) | 22nd century |
| P155 | follows | ... | Q6927 (20th century) | 20th century |
| P527 | has part(s) | ... | Q35024 (2000s) | 2000s |
| P527 | has part(s) | ... | Q19022 (2010s) | 2010s |
| P527 | has part(s) | ... | Q534495 (2020s) | 2020s |
| P527 | has part(s) | ... | Q578722 (2060s) | 2060s |
| P527 | has part(s) | ... | Q713789 (2030s) | 2030s |
| P527 | has part(s) | ... | Q651002 (2050s) | 2050s |
| P527 | has part(s) | ... | Q727084 (2080s) | 2080s |
| P527 | has part(s) | ... | Q845811 (2090s) | 2090s |
| P527 | has part(s) | ... | Q651007 (2040s) | 2040s |
| P527 | has part(s) | ... | Q651036 (2070s) | 2070s |
| P31 | instance of | ... | Q578 (century) | century |
| P2561 | name | Monolingualtext | 21st-century | ??? |
| P361 | part of | ... | Q26224 (3rd millennium) | 3rd millennium |
| P2959 | permanent duplicated item | ... | Q31798761 (???) | ??? |
| P2959 | permanent duplicated item | ... | Q113561423 (???) | ??? |
| P585 | point in time | ... | 2100-01-01 | ??? |
| P7084 | related category | ... | Q7470221 (Category:21st century-related lists) | Category:21st century-related lists |
| P1482 | Stack Exchange tag | Url | Newest '21st-century' Questions - History Stack Exchange | ??? |
| P580 | start time | ... | 2001-01-01 | ??? |
| P910 | topic's main category | ... | Q5610183 (Category:21st century) | Category:21st century |
| P1151 | topic's main Wikimedia portal | ... | Q17364272 (Portal:21st century) | Portal:21st century |
| P9084 | ABC News topic ID | 21st-century |
| P1014 | Art & Architecture Thesaurus ID | 300404515 |
| P5198 | ASC Leiden Thesaurus ID | 294896112 |
| P13059 | Babelio subject ID | 10821 |
| P2581 | BabelNet ID | 01157225n |
| P2581 | BabelNet ID | 01157225n |
| P1617 | BBC Things ID | ebebf9f5-33a6-491b-8ab5-412e453d5c0a |
| P268 | Bibliothèque nationale de France ID | 11930812p |
| P12288 | Cathopedia article ID | XXI_secolo |
| P8248 | Colon Classification | P |
| P9272 | DeCS ID | 38897 |
| P7847 | DigitaltMuseum ID | 029996972410 |
| P8168 | FactGrid item ID | Q395440 |
| P2163 | FAST ID | 1159816 |
| P4306 | FOIH periods ID | 21 |
| P646 | Freebase ID | /m/08b43 |
| P11924 | IMDb keyword | 21st-century |
| P7885 | Joconde time period ID | T521-1338 |
| P8408 | KBpedia ID | TheTwentyFirstCenturyCE |
| P1248 | KulturNav-ID | d2441ec4-7d8c-4f98-95aa-9acfd539571b |
| P244 | Library of Congress authority ID | sh85139024 |
| P244 | Library of Congress authority ID | sh2002012478 |
| P6694 | MeSH concept ID | M0467928 |
| P486 | MeSH descriptor ID | D049674 |
| P6680 | MeSH term ID | T592696 |
| P672 | MeSH tree code | K01.400.504.984 |
| P6366 | Microsoft Academic ID (discontinued) | 2909423622 |
| P8885 | Namuwiki ID | 21세기 |
| P9495 | National Historical Museums of Sweden ID | term/C7A29F81-9598-4865-B1A0-76EBF34340F7 |
| P8189 | National Library of Israel J9U ID | 987007558420805171 |
| P1368 | National Library of Latvia ID | 000060245 |
| P691 | NL CR AUT ID | ch460559 |
| P691 | NL CR AUT ID | ph126112 |
| P6228 | OesterreichWiki ID | 15582 |
| P3847 | Open Library subject ID | 21st_century |
| P3847 | Open Library subject ID | time:21st_century |
| P3847 | Open Library subject ID | twenty-first_century |
| P4212 | PACTOLS thesaurus ID | pcrteByKqYsfRI |
| P3417 | Quora topic ID | 21-Century |
| P3417 | Quora topic ID | XXI-Century |
| P12800 | Vikidia article ID | fr:XXIe_siècle |
| P12086 | WikiKids ID | 21e_eeuw |
| P13591 | Yale LUX ID | concept/7d258427-4866-4816-ad48-feeacdd5643f |
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