Compare 209 vs 221
| Property | 209 | 221 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 111 × 191 | 131 × 171 |
| Prime factorization | 11 × 19 | 13 × 17 |
| Divisors count | 4 | 4 |
| Divisors | 1, 11, 19, 209 | 1, 13, 17, 221 |
| Number of properties | 1 | 1 |
| Semiprimes | 68th | 75th |
| Roman numberals | CCIX | CCXXI |
| Base 2 | 110100012 | 110111012 |
| Base 3 | 212023 | 220123 |
| Base 4 | 31014 | 31314 |
| Base 5 | 13145 | 13415 |
| Base 6 | 5456 | 10056 |
| Base 7 | 4167 | 4347 |
| Base 8 | 3218 | 3358 |
| Base 9 | 2529 | 2659 |
| Base 10 | 20910 | 22110 |
| Base 11 | 18011 | 19111 |
| Base 12 | 15512 | 16512 |
| Base 13 | 13113 | 14013 |
| Base 14 | 10d14 | 11b14 |
| Base 15 | de15 | eb15 |
| Base 16 | d116 | dd16 |