21965927 has 2 divisors, whose sum is σ = 21965928. Its totient is φ = 21965926.

The previous prime is 21965899. The next prime is 21965959. The reversal of 21965927 is 72956912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21965927 - 2⁶ = 21965863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21965987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10982963 + 10982964.

It is an arithmetic number, because the mean of its divisors is an integer number (10982964).

Almost surely, 2^21965927 is an apocalyptic number.

21965927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21965927 is an equidigital number, since it uses as much as digits as its factorization.

21965927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 21965927 is about 4686.7821583684. The cubic root of 21965927 is about 280.0592009175.

The spelling of 21965927 in words is "twenty-one million, nine hundred sixty-five thousand, nine hundred twenty-seven".