21464256 has 56 divisors (see below), whose sum is σ = 61959744. Its totient is φ = 6503680.

The previous prime is 21464249. The next prime is 21464269. The reversal of 21464256 is 65246412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2970 + ... + 7193.

It is an arithmetic number, because the mean of its divisors is an integer number (1106424).

Almost surely, 2^21464256 is an apocalyptic number.

It is an amenable number.

21464256 is an abundant number, since it is smaller than the sum of its proper divisors (40495488).

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

21464256 is a wasteful number, since it uses less digits than its factorization.

21464256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10189 (or 10179 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 21464256 is about 4632.9532697838. The cubic root of 21464256 is about 277.9107074819.

The spelling of 21464256 in words is "twenty-one million, four hundred sixty-four thousand, two hundred fifty-six".