Prime Factorization |
3 x 7 |
Divisors |
1, 3, 7, 21 |
Count of divisors |
4 |
Sum of divisors |
32 |
Previous integer |
20 |
Next integer |
22 |
Is prime? |
NO |
Previous prime |
19 |
Next prime |
23 |
21st prime number |
↻ calculating, please wait |
Is a Fibonacci number? |
YES |
Previous Fibonacci number |
6765 |
Next Fibonacci number |
17711 |
21st Fibonacci number |
10946 |
Zeckendorf representation |
21 |
Is a Pell number? |
NO |
Is a regular number? |
NO |
Is a perfect number? |
NO |
Is a perfect square number? |
NO |
Is a perfect cube number? |
NO |
Is power of 2? |
NO |
Is power of 3? |
NO |
Factorial 21! |
5.1090942171709E+19 |
Square 212 |
441 |
Square root √21 |
4.5825756949558 |
Cube 213 |
9261 |
Cubic root ∛21 |
2.7589241763811 |
Natural logarithm |
3.0445224377234 |
Decimal logarithm |
1.3222192947339 |