Compare 218 vs 221
| Property | 218 | 221 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 21 × 1091 | 131 × 171 |
| Prime factorization | 2 × 109 | 13 × 17 |
| Divisors count | 4 | 4 |
| Divisors | 1, 2, 109, 218 | 1, 13, 17, 221 |
| Number of properties | 1 | 1 |
| Semiprimes | 73rd | 75th |
| Roman numberals | CCXVIII | CCXXI |
| Base 2 | 110110102 | 110111012 |
| Base 3 | 220023 | 220123 |
| Base 4 | 31224 | 31314 |
| Base 5 | 13335 | 13415 |
| Base 6 | 10026 | 10056 |
| Base 7 | 4317 | 4347 |
| Base 8 | 3328 | 3358 |
| Base 9 | 2629 | 2659 |
| Base 10 | 21810 | 22110 |
| Base 11 | 18911 | 19111 |
| Base 12 | 16212 | 16512 |
| Base 13 | 13a13 | 14013 |
| Base 14 | 11814 | 11b14 |
| Base 15 | e815 | eb15 |
| Base 16 | da16 | dd16 |