Compare 21977 vs 21985
| Property | 21977 | 21985 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 219771 | 51 × 43971 |
| Prime factorization | 21977 | 5 × 4397 |
| Divisors count | 2 | 4 |
| Divisors | 1, 21977 | 1, 5, 4397, 21985 |
| Number of properties | 6 | 1 |
| Chen primes | 1207th | |
| Harmonic primes | 906th | |
| Isolated primes | 1719th | |
| Long primes | 931st | |
| Primes | 2462nd | |
| Pythagorean primes | 1222nd | |
| Semiprimes | 5550th | |
| Roman numberals | ||
| Base 2 | 1010101110110012 | 1010101111000012 |
| Base 3 | 10100102223 | 10100110213 |
| Base 4 | 111131214 | 111132014 |
| Base 5 | 12004025 | 12004205 |
| Base 6 | 2454256 | 2454416 |
| Base 7 | 1210347 | 1210457 |
| Base 8 | 527318 | 527418 |
| Base 9 | 331289 | 331379 |
| Base 10 | 2197710 | 2198510 |
| Base 11 | 1556a11 | 1557711 |
| Base 12 | 1087512 | 1088112 |
| Base 13 | a00713 | a01213 |
| Base 14 | 801b14 | 802514 |
| Base 15 | 67a215 | 67aa15 |
| Base 16 | 55d916 | 55e116 |