21056264 has 24 divisors (see below), whose sum is σ = 40282410. Its totient is φ = 10318464.

The previous prime is 21056263. The next prime is 21056281. The reversal of 21056264 is 46265012.

It can be written as a sum of positive squares in 3 ways, for example, as 17222500 + 3833764 = 4150^2 + 1958^2 .

It is not an unprimeable number, because it can be changed into a prime (21056263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22004 + ... + 22940.

Almost surely, 2^21056264 is an apocalyptic number.

It is an amenable number.

21056264 is a deficient number, since it is larger than the sum of its proper divisors (19226146).

21056264 is an equidigital number, since it uses as much as digits as its factorization.

21056264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 992 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21056264 is about 4588.7104942456. The cubic root of 21056264 is about 276.1385917410.

The spelling of 21056264 in words is "twenty-one million, fifty-six thousand, two hundred sixty-four".