Compare 21997 vs 21997
| Property | 21997 | 21997 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 219971 | 219971 |
| Prime factorization | 21997 | 21997 |
| Divisors count | 2 | 2 |
| Divisors | 1, 21997 | 1, 21997 |
| Number of properties | 8 | 8 |
| Chen primes | 1209th | 1209th |
| Isolated primes | 1721st | 1721st |
| Left-truncatable primes | 173rd | 173rd |
| Primes | 2464th | 2464th |
| Pythagorean primes | 1223rd | 1223rd |
| Sexy primes (1st member) | 743rd | 743rd |
| Sexy primes (2nd member) | 742nd | 742nd |
| Sexy prime triplets (2nd member) | 202nd | 202nd |
| Roman numberals | ||
| Base 2 | 1010101111011012 | 1010101111011012 |
| Base 3 | 10100112013 | 10100112013 |
| Base 4 | 111132314 | 111132314 |
| Base 5 | 12004425 | 12004425 |
| Base 6 | 2455016 | 2455016 |
| Base 7 | 1210637 | 1210637 |
| Base 8 | 527558 | 527558 |
| Base 9 | 331519 | 331519 |
| Base 10 | 2199710 | 2199710 |
| Base 11 | 1558811 | 1558811 |
| Base 12 | 1089112 | 1089112 |
| Base 13 | a02113 | a02113 |
| Base 14 | 803314 | 803314 |
| Base 15 | 67b715 | 67b715 |
| Base 16 | 55ed16 | 55ed16 |