Base | Representation |
---|---|
bin | 101001110101… |
… | …0111001001001 |
3 | 1112021100022002 |
4 | 1103222321021 |
5 | 21103334031 |
6 | 2102040345 |
7 | 354301322 |
oct | 123527111 |
9 | 45240262 |
10 | 21933641 |
11 | 11421084 |
12 | 74190b5 |
13 | 470c5b2 |
14 | 2cad449 |
15 | 1dd3ccb |
hex | 14eae49 |
21933641 has 2 divisors, whose sum is σ = 21933642. Its totient is φ = 21933640.
The previous prime is 21933629. The next prime is 21933643. The reversal of 21933641 is 14633912.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 19891600 + 2042041 = 4460^2 + 1429^2 .
It is a cyclic number.
It is not a de Polignac number, because 21933641 - 26 = 21933577 is a prime.
Together with 21933643, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (21933643) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10966820 + 10966821.
It is an arithmetic number, because the mean of its divisors is an integer number (10966821).
Almost surely, 221933641 is an apocalyptic number.
It is an amenable number.
21933641 is a deficient number, since it is larger than the sum of its proper divisors (1).
21933641 is an equidigital number, since it uses as much as digits as its factorization.
21933641 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 3888, while the sum is 29.
The square root of 21933641 is about 4683.3365243168. The cubic root of 21933641 is about 279.9219212568.
The spelling of 21933641 in words is "twenty-one million, nine hundred thirty-three thousand, six hundred forty-one".
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