Compare 21981 vs 21991
Property | 21981 | 21991 |
---|---|---|
Type | composite number | prime |
Unique factors | 3 | 1 |
Total factors | 3 | 1 |
Prime factorization | 31 × 171 × 4311 | 219911 |
Prime factorization | 3 × 17 × 431 | 21991 |
Divisors count | 8 | 2 |
Divisors | 1, 3, 17, 51, 431, 1293, 7327, 21981 | 1, 21991 |
Number of properties | 0 | 5 |
Chen primes | 1208th | |
Isolated primes | 1720th | |
Primes | 2463rd | |
Sexy primes (1st member) | 742nd | |
Sexy prime triplets (1st member) | 202nd | |
Roman numberals | ||
Base 2 | 1010101110111012 | 1010101111001112 |
Base 3 | 10100110103 | 10100111113 |
Base 4 | 111131314 | 111132134 |
Base 5 | 12004115 | 12004315 |
Base 6 | 2454336 | 2454516 |
Base 7 | 1210417 | 1210547 |
Base 8 | 527358 | 527478 |
Base 9 | 331339 | 331449 |
Base 10 | 2198110 | 2199110 |
Base 11 | 1557311 | 1558211 |
Base 12 | 1087912 | 1088712 |
Base 13 | a00b13 | a01813 |
Base 14 | 802114 | 802b14 |
Base 15 | 67a615 | 67b115 |
Base 16 | 55dd16 | 55e716 |