Positive Integers » 20001-30000 » 21901-22000 » 21981
Divisors of the Positive Integer 21981
1, 3, 17, 51, 431, 1293, 7327, 21981Sum of all the Divisors of 21981, including itself
31104Sum of the Proper Divisors of 21981
9123Properties of the number 21981
The integer 21981 is an odd number.The integer 21981 is a Composite number.
9123 is less than 21981, so 21981 is a deficient number.
The number 21981 as a Roman Numeral
_X_XMCMLXXXI (Roman Numerals with underscores in front have their values increased by 1,000. The underscore represents a line over the numeral, because the Romans used overlines to multiply by 1,000.)The number 21981 in various Numeral Systems
| Base | Representation |
|---|---|
| 2: | 101010111011101 |
| 3: | 1010011010 |
| 4: | 11113131 |
| 5: | 1200411 |
| 6: | 245433 |
| 7: | 121041 |
| 8: | 52735 |
| 9: | 33133 |
| 10: | 21981 |
| 11: | 15573 |
| 12: | 10879 |
| 13: | A00B |
| 14: | 8021 |
| 15: | 67A6 |
| 16: | 55DD |
| 17: | 4810 |
| 18: | 3DF3 |
| 19: | 33GH |
| 20: | 2EJ1 |
| 21: | 27HF |
| 22: | 2193 |
| 23: | 1ICG |
| 24: | 1E3L |
| 25: | 1A46 |
| 26: | 16DB |
| 27: | 1343 |
| 28: | 1011 |
| 29: | Q3S |
| 30: | OCL |
| 31: | MR2 |
| 32: | LET |
| 33: | K63 |
| 34: | J0H |
| 35: | HX1 |
| 36: | GYL |