Twenty-One
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|---|---|---|---|---|
| Cardinal | twenty-one | |||
| Ordinal | 21st (twenty-first) |
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| Factorization | 3 × 7 | |||
| Divisors | 1, 3, 7, 21 | |||
| Roman numeral | XXI | |||
| Binary | 101012 | |||
| Ternary | 2103 | |||
| Quaternary | 1114 | |||
| Quinary | 415 | |||
| Senary | 336 | |||
| Octal | 258 | |||
| Duodecimal | 1912 | |||
| Hexadecimal | 1516 | |||
| Vigesimal | 1120 | |||
| Base 36 | L36 | |||
21 (twenty-one) is the natural number following 20 and preceding 22.
21 is:
21 appears in the Padovan sequence, preceded by the terms 9, 12, 16 (it is the sum of the first two of these).
21 is:
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