Compare 21 vs 40
| Property | 21 | 40 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 2 |
| Total factors | 2 | 4 |
| Prime factorization | 31 × 71 | 23 × 51 |
| Prime factorization | 3 × 7 | 2 × 2 × 2 × 5 |
| Divisors count | 4 | 8 |
| Divisors | 1, 3, 7, 21 | 1, 2, 4, 5, 8, 10, 20, 40 |
| Number of properties | 1 | 0 |
| Semiprimes | 7th | |
| Roman numberals | XXI | XL |
| Base 2 | 101012 | 1010002 |
| Base 3 | 2103 | 11113 |
| Base 4 | 1114 | 2204 |
| Base 5 | 415 | 1305 |
| Base 6 | 336 | 1046 |
| Base 7 | 307 | 557 |
| Base 8 | 258 | 508 |
| Base 9 | 239 | 449 |
| Base 10 | 2110 | 4010 |
| Base 11 | 1a11 | 3711 |
| Base 12 | 1912 | 3412 |
| Base 13 | 1813 | 3113 |
| Base 14 | 1714 | 2c14 |
| Base 15 | 1615 | 2a15 |
| Base 16 | 1516 | 2816 |