Compare 21991 vs 21995
| Property | 21991 | 21995 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 219911 | 51 × 531 × 831 |
| Prime factorization | 21991 | 5 × 53 × 83 |
| Divisors count | 2 | 8 |
| Divisors | 1, 21991 | 1, 5, 53, 83, 265, 415, 4399, 21995 |
| 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 | 1010101111010112 |
| Base 3 | 10100111113 | 10100111223 |
| Base 4 | 111132134 | 111132234 |
| Base 5 | 12004315 | 12004405 |
| Base 6 | 2454516 | 2454556 |
| Base 7 | 1210547 | 1210617 |
| Base 8 | 527478 | 527538 |
| Base 9 | 331449 | 331489 |
| Base 10 | 2199110 | 2199510 |
| Base 11 | 1558211 | 1558611 |
| Base 12 | 1088712 | 1088b12 |
| Base 13 | a01813 | a01c13 |
| Base 14 | 802b14 | 803114 |
| Base 15 | 67b115 | 67b515 |
| Base 16 | 55e716 | 55eb16 |