Compare 21155 vs 21157
| Property | 21155 | 21157 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 42311 | 211571 |
| Prime factorization | 5 × 4231 | 21157 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 4231, 21155 | 1, 21157 |
| Number of properties | 1 | 5 |
| Isolated primes | 1659th | |
| Primes | 2378th | |
| Pythagorean primes | 1181st | |
| Semiprimes | 5363rd | |
| Sexy primes (1st member) | 720th | |
| Sexy prime triplets (1st member) | 197th | |
| Roman numberals | ||
| Base 2 | 1010010101000112 | 1010010101001012 |
| Base 3 | 10020001123 | 10020001213 |
| Base 4 | 110222034 | 110222114 |
| Base 5 | 11341105 | 11341125 |
| Base 6 | 2415356 | 2415416 |
| Base 7 | 1154517 | 1154537 |
| Base 8 | 512438 | 512458 |
| Base 9 | 320159 | 320179 |
| Base 10 | 2115510 | 2115710 |
| Base 11 | 1499211 | 1499411 |
| Base 12 | 102ab12 | 102b112 |
| Base 13 | 982413 | 982613 |
| Base 14 | 79d114 | 79d314 |
| Base 15 | 640515 | 640715 |
| Base 16 | 52a316 | 52a516 |