Compare 215 vs 221
| Property | 215 | 221 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 51 × 431 | 131 × 171 |
| Prime factorization | 5 × 43 | 13 × 17 |
| Divisors count | 4 | 4 |
| Divisors | 1, 5, 43, 215 | 1, 13, 17, 221 |
| Number of properties | 1 | 1 |
| Semiprimes | 71st | 75th |
| Roman numberals | CCXV | CCXXI |
| Base 2 | 110101112 | 110111012 |
| Base 3 | 212223 | 220123 |
| Base 4 | 31134 | 31314 |
| Base 5 | 13305 | 13415 |
| Base 6 | 5556 | 10056 |
| Base 7 | 4257 | 4347 |
| Base 8 | 3278 | 3358 |
| Base 9 | 2589 | 2659 |
| Base 10 | 21510 | 22110 |
| Base 11 | 18611 | 19111 |
| Base 12 | 15b12 | 16512 |
| Base 13 | 13713 | 14013 |
| Base 14 | 11514 | 11b14 |
| Base 15 | e515 | eb15 |
| Base 16 | d716 | dd16 |