Compare 221 vs 247
| Property | 221 | 247 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 131 × 171 | 131 × 191 |
| Prime factorization | 13 × 17 | 13 × 19 |
| Divisors count | 4 | 4 |
| Divisors | 1, 13, 17, 221 | 1, 13, 19, 247 |
| Number of properties | 1 | 1 |
| Semiprimes | 75th | 79th |
| Roman numberals | CCXXI | CCXLVII |
| Base 2 | 110111012 | 111101112 |
| Base 3 | 220123 | 1000113 |
| Base 4 | 31314 | 33134 |
| Base 5 | 13415 | 14425 |
| Base 6 | 10056 | 10516 |
| Base 7 | 4347 | 5027 |
| Base 8 | 3358 | 3678 |
| Base 9 | 2659 | 3049 |
| Base 10 | 22110 | 24710 |
| Base 11 | 19111 | 20511 |
| Base 12 | 16512 | 18712 |
| Base 13 | 14013 | 16013 |
| Base 14 | 11b14 | 13914 |
| Base 15 | eb15 | 11715 |
| Base 16 | dd16 | f716 |