Compare 1 vs 21
Property | 1 | 21 |
---|---|---|
Type | composite number | semiprime |
Unique factors | 0 | 2 |
Total factors | 0 | 2 |
Prime factorization | 31 × 71 | |
Prime factorization | 3 × 7 | |
Divisors count | 1 | 4 |
Divisors | 1 | 1, 3, 7, 21 |
Number of properties | 0 | 1 |
Semiprimes | 7th | |
Roman numberals | I | XXI |
Base 2 | 12 | 101012 |
Base 3 | 13 | 2103 |
Base 4 | 14 | 1114 |
Base 5 | 15 | 415 |
Base 6 | 16 | 336 |
Base 7 | 17 | 307 |
Base 8 | 18 | 258 |
Base 9 | 19 | 239 |
Base 10 | 110 | 2110 |
Base 11 | 111 | 1a11 |
Base 12 | 112 | 1912 |
Base 13 | 113 | 1813 |
Base 14 | 114 | 1714 |
Base 15 | 115 | 1615 |
Base 16 | 116 | 1516 |