Compare 21871 vs 21991
| Property | 21871 | 21991 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 218711 | 219911 |
| Prime factorization | 21871 | 21991 |
| Divisors count | 2 | 2 |
| Divisors | 1, 21871 | 1, 21991 |
| Number of properties | 3 | 5 |
| Additive primes | 1135th | |
| Chen primes | 1208th | |
| Isolated primes | 1711th | 1720th |
| Primes | 2454th | 2463rd |
| Sexy primes (1st member) | 742nd | |
| Sexy prime triplets (1st member) | 202nd | |
| Roman numberals | ||
| Base 2 | 1010101011011112 | 1010101111001112 |
| Base 3 | 10100000013 | 10100111113 |
| Base 4 | 111112334 | 111132134 |
| Base 5 | 11444415 | 12004315 |
| Base 6 | 2451316 | 2454516 |
| Base 7 | 1205237 | 1210547 |
| Base 8 | 525578 | 527478 |
| Base 9 | 330019 | 331449 |
| Base 10 | 2187110 | 2199110 |
| Base 11 | 1548311 | 1558211 |
| Base 12 | 107a712 | 1088712 |
| Base 13 | 9c5513 | a01813 |
| Base 14 | 7d8314 | 802b14 |
| Base 15 | 673115 | 67b115 |
| Base 16 | 556f16 | 55e716 |