Compare 21991 vs 21996
| Property | 21991 | 21996 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 4 |
| Total factors | 1 | 6 |
| Prime factorization | 219911 | 22 × 32 × 131 × 471 |
| Prime factorization | 21991 | 2 × 2 × 3 × 3 × 13 × 47 |
| Divisors count | 2 | 36 |
| Divisors | 1, 21991 | 1, 2, 3, 4, 6, 9, 12, 13, 18, 26, 36, 39, 47, 52, 78, 94, 117, 141, 156, 188, 234, 282, 423, 468, 564, 611, 846, 1222, 1692, 1833, 2444, 3666, 5499, 7332, 10998, 21996 |
| Number of properties | 5 | 0 |
| Chen primes | 1208th | |
| Isolated primes | 1720th | |
| Primes | 2463rd | |
| Sexy primes (1st member) | 742nd | |
| Sexy prime triplets (1st member) | 202nd | |
| Roman numberals | ||
| Base 2 | 1010101111001112 | 1010101111011002 |
| Base 3 | 10100111113 | 10100112003 |
| Base 4 | 111132134 | 111132304 |
| Base 5 | 12004315 | 12004415 |
| Base 6 | 2454516 | 2455006 |
| Base 7 | 1210547 | 1210627 |
| Base 8 | 527478 | 527548 |
| Base 9 | 331449 | 331509 |
| Base 10 | 2199110 | 2199610 |
| Base 11 | 1558211 | 1558711 |
| Base 12 | 1088712 | 1089012 |
| Base 13 | a01813 | a02013 |
| Base 14 | 802b14 | 803214 |
| Base 15 | 67b115 | 67b615 |
| Base 16 | 55e716 | 55ec16 |