21

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URI: http://km.aifb.kit.edu/projects/numbers/n21 [URI4URI]

External links

Wikipedia: 21_(number)
Wikidata: Q712477

Names

Estonian: kakskümmend üks
Czech: dvacet jedna
Portuguese: vinte e um
Lithuanian: dvideðimt vienas
French: vingt et un
Italian: ventuno
Spanish: veintiuno
German: einundzwanzig
English: twenty-one

Other systems

Roman: XXI
Binary: 10101
Octal: 25
Duodecimal: 19
Hexadecimal: 15
Hexatridecimal: l

Properties

Natural logarithm: 3.0445224377234
Binary logarithm: 4.3923174227788
Common logarithm: 1.3222192947339
Prime factors: 1 * 3 * 7
Digit sum: 3

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Published April 1, 2010