Compare 4 vs 21
Property | 4 | 21 |
---|---|---|
Type | semiprime | semiprime |
Unique factors | 1 | 2 |
Total factors | 2 | 2 |
Prime factorization | 22 | 31 × 71 |
Prime factorization | 2 × 2 | 3 × 7 |
Divisors count | 3 | 4 |
Divisors | 1, 2, 4 | 1, 3, 7, 21 |
Number of properties | 1 | 1 |
Semiprimes | 1st | 7th |
Roman numberals | IV | XXI |
Base 2 | 1002 | 101012 |
Base 3 | 113 | 2103 |
Base 4 | 104 | 1114 |
Base 5 | 45 | 415 |
Base 6 | 46 | 336 |
Base 7 | 47 | 307 |
Base 8 | 48 | 258 |
Base 9 | 49 | 239 |
Base 10 | 410 | 2110 |
Base 11 | 411 | 1a11 |
Base 12 | 412 | 1912 |
Base 13 | 413 | 1813 |
Base 14 | 414 | 1714 |
Base 15 | 415 | 1615 |
Base 16 | 416 | 1516 |