Compare 21387 vs 21391
| Property | 21387 | 21391 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 31 × 71291 | 213911 |
| Prime factorization | 3 × 7129 | 21391 |
| Divisors count | 4 | 2 |
| Divisors | 1, 3, 7129, 21387 | 1, 21391 |
| Number of properties | 1 | 3 |
| Isolated primes | 1676th | |
| Primes | 2401st | |
| Semiprimes | 5419th | |
| Sexy primes (1st member) | 729th | |
| Roman numberals | ||
| Base 2 | 1010011100010112 | 1010011100011112 |
| Base 3 | 10021000103 | 10021000213 |
| Base 4 | 110320234 | 110320334 |
| Base 5 | 11410225 | 11410315 |
| Base 6 | 2430036 | 2430116 |
| Base 7 | 1162327 | 1162367 |
| Base 8 | 516138 | 516178 |
| Base 9 | 323039 | 323079 |
| Base 10 | 2138710 | 2139110 |
| Base 11 | 1508311 | 1508711 |
| Base 12 | 1046312 | 1046712 |
| Base 13 | 997213 | 997613 |
| Base 14 | 7b1914 | 7b1d14 |
| Base 15 | 650c15 | 651115 |
| Base 16 | 538b16 | 538f16 |