Compare 210 vs 221
| Property | 210 | 221 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 4 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 21 × 31 × 51 × 71 | 131 × 171 |
| Prime factorization | 2 × 3 × 5 × 7 | 13 × 17 |
| Divisors count | 16 | 4 |
| Divisors | 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210 | 1, 13, 17, 221 |
| Number of properties | 0 | 1 |
| Semiprimes | 75th | |
| Roman numberals | CCX | CCXXI |
| Base 2 | 110100102 | 110111012 |
| Base 3 | 212103 | 220123 |
| Base 4 | 31024 | 31314 |
| Base 5 | 13205 | 13415 |
| Base 6 | 5506 | 10056 |
| Base 7 | 4207 | 4347 |
| Base 8 | 3228 | 3358 |
| Base 9 | 2539 | 2659 |
| Base 10 | 21010 | 22110 |
| Base 11 | 18111 | 19111 |
| Base 12 | 15612 | 16512 |
| Base 13 | 13213 | 14013 |
| Base 14 | 11014 | 11b14 |
| Base 15 | e015 | eb15 |
| Base 16 | d216 | dd16 |