21814656 has 32 divisors (see below), whose sum is σ = 57946200. Its totient is φ = 7271424.

The previous prime is 21814633. The next prime is 21814703. The reversal of 21814656 is 65641812.

It is a tau number, because it is divible by the number of its divisors (32).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 28021 + ... + 28788.

Almost surely, 2^21814656 is an apocalyptic number.

It is an amenable number.

21814656 is an abundant number, since it is smaller than the sum of its proper divisors (36131544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21814656 is an equidigital number, since it uses as much as digits as its factorization.

21814656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56826 (or 56814 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 21814656 is about 4670.6162334322. The cubic root of 21814656 is about 279.4148323409.

The spelling of 21814656 in words is "twenty-one million, eight hundred fourteen thousand, six hundred fifty-six".