Compare 21391 vs 21398
| Property | 21391 | 21398 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 213911 | 21 × 131 × 8231 |
| Prime factorization | 21391 | 2 × 13 × 823 |
| Divisors count | 2 | 8 |
| Divisors | 1, 21391 | 1, 2, 13, 26, 823, 1646, 10699, 21398 |
| Number of properties | 3 | 0 |
| Isolated primes | 1676th | |
| Primes | 2401st | |
| Sexy primes (1st member) | 729th | |
| Roman numberals | ||
| Base 2 | 1010011100011112 | 1010011100101102 |
| Base 3 | 10021000213 | 10021001123 |
| Base 4 | 110320334 | 110321124 |
| Base 5 | 11410315 | 11410435 |
| Base 6 | 2430116 | 2430226 |
| Base 7 | 1162367 | 1162467 |
| Base 8 | 516178 | 516268 |
| Base 9 | 323079 | 323159 |
| Base 10 | 2139110 | 2139810 |
| Base 11 | 1508711 | 1509311 |
| Base 12 | 1046712 | 1047212 |
| Base 13 | 997613 | 998013 |
| Base 14 | 7b1d14 | 7b2614 |
| Base 15 | 651115 | 651815 |
| Base 16 | 538f16 | 539616 |