Compare 21991 vs 21998
Property | 21991 | 21998 |
---|---|---|
Type | prime | composite number |
Unique factors | 1 | 3 |
Total factors | 1 | 3 |
Prime factorization | 219911 | 21 × 171 × 6471 |
Prime factorization | 21991 | 2 × 17 × 647 |
Divisors count | 2 | 8 |
Divisors | 1, 21991 | 1, 2, 17, 34, 647, 1294, 10999, 21998 |
Number of properties | 5 | 0 |
Chen primes | 1208th | |
Isolated primes | 1720th | |
Primes | 2463rd | |
Sexy primes (1st member) | 742nd | |
Sexy prime triplets (1st member) | 202nd | |
Roman numberals | ||
Base 2 | 1010101111001112 | 1010101111011102 |
Base 3 | 10100111113 | 10100112023 |
Base 4 | 111132134 | 111132324 |
Base 5 | 12004315 | 12004435 |
Base 6 | 2454516 | 2455026 |
Base 7 | 1210547 | 1210647 |
Base 8 | 527478 | 527568 |
Base 9 | 331449 | 331529 |
Base 10 | 2199110 | 2199810 |
Base 11 | 1558211 | 1558911 |
Base 12 | 1088712 | 1089212 |
Base 13 | a01813 | a02213 |
Base 14 | 802b14 | 803414 |
Base 15 | 67b115 | 67b815 |
Base 16 | 55e716 | 55ee16 |