Compare 221 vs 253
| Property | 221 | 253 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 131 × 171 | 111 × 231 |
| Prime factorization | 13 × 17 | 11 × 23 |
| Divisors count | 4 | 4 |
| Divisors | 1, 13, 17, 221 | 1, 11, 23, 253 |
| Number of properties | 1 | 1 |
| Semiprimes | 75th | 81st |
| Roman numberals | CCXXI | CCLIII |
| Base 2 | 110111012 | 111111012 |
| Base 3 | 220123 | 1001013 |
| Base 4 | 31314 | 33314 |
| Base 5 | 13415 | 20035 |
| Base 6 | 10056 | 11016 |
| Base 7 | 4347 | 5117 |
| Base 8 | 3358 | 3758 |
| Base 9 | 2659 | 3119 |
| Base 10 | 22110 | 25310 |
| Base 11 | 19111 | 21011 |
| Base 12 | 16512 | 19112 |
| Base 13 | 14013 | 16613 |
| Base 14 | 11b14 | 14114 |
| Base 15 | eb15 | 11d15 |
| Base 16 | dd16 | fd16 |