Compare 21520 vs 21521
| Property | 21520 | 21521 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 6 | 1 |
| Prime factorization | 24 × 51 × 2691 | 215211 |
| Prime factorization | 2 × 2 × 2 × 2 × 5 × 269 | 21521 |
| Divisors count | 20 | 2 |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 269, 538, 1076, 1345, 2152, 2690, 4304, 5380, 10760, 21520 | 1, 21521 |
| Number of properties | 0 | 7 |
| Additive primes | 1119th | |
| Chen primes | 1184th | |
| Cousin primes (2nd member) | 368th | |
| Primes | 2415th | |
| Prime triplets (2nd member) | 183rd | |
| Pythagorean primes | 1197th | |
| Twin primes (1st member) | 365th | |
| Roman numberals | ||
| Base 2 | 1010100000100002 | 1010100000100012 |
| Base 3 | 10021120013 | 10021120023 |
| Base 4 | 111001004 | 111001014 |
| Base 5 | 11420405 | 11420415 |
| Base 6 | 2433446 | 2433456 |
| Base 7 | 1165127 | 1165137 |
| Base 8 | 520208 | 520218 |
| Base 9 | 324619 | 324629 |
| Base 10 | 2152010 | 2152110 |
| Base 11 | 1519411 | 1519511 |
| Base 12 | 1055412 | 1055512 |
| Base 13 | 9a4513 | 9a4613 |
| Base 14 | 7bb214 | 7bb314 |
| Base 15 | 659a15 | 659b15 |
| Base 16 | 541016 | 541116 |