21913627 has 2 divisors, whose sum is σ = 21913628. Its totient is φ = 21913626.

The previous prime is 21913601. The next prime is 21913637. The reversal of 21913627 is 72631912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21913627 - 2⁷ = 21913499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21913637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10956813 + 10956814.

It is an arithmetic number, because the mean of its divisors is an integer number (10956814).

Almost surely, 2^21913627 is an apocalyptic number.

21913627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21913627 is an equidigital number, since it uses as much as digits as its factorization.

21913627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 21913627 is about 4681.1993121421. The cubic root of 21913627 is about 279.8367543328.

The spelling of 21913627 in words is "twenty-one million, nine hundred thirteen thousand, six hundred twenty-seven".