Compare 21557 vs 21991
| Property | 21557 | 21991 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 215571 | 219911 |
| Prime factorization | 21557 | 21991 |
| Divisors count | 2 | 2 |
| Divisors | 1, 21557 | 1, 21991 |
| Number of properties | 8 | 5 |
| Chen primes | 1186th | 1208th |
| Good primes | 273rd | |
| Isolated primes | 1720th | |
| Primes | 2418th | 2463rd |
| Prime triplets (1st member) | 184th | |
| Pythagorean primes | 1199th | |
| Sexy primes (1st member) | 736th | 742nd |
| Sexy prime triplets (1st member) | 201st | 202nd |
| Twin primes (1st member) | 366th | |
| Roman numberals | ||
| Base 2 | 1010100001101012 | 1010101111001112 |
| Base 3 | 10021201023 | 10100111113 |
| Base 4 | 111003114 | 111132134 |
| Base 5 | 11422125 | 12004315 |
| Base 6 | 2434456 | 2454516 |
| Base 7 | 1165647 | 1210547 |
| Base 8 | 520658 | 527478 |
| Base 9 | 325129 | 331449 |
| Base 10 | 2155710 | 2199110 |
| Base 11 | 1521811 | 1558211 |
| Base 12 | 1058512 | 1088712 |
| Base 13 | 9a7313 | a01813 |
| Base 14 | 7bdb14 | 802b14 |
| Base 15 | 65c215 | 67b115 |
| Base 16 | 543516 | 55e716 |