21083264 has 32 divisors (see below), whose sum is σ = 44477100. Its totient is φ = 9920512.

The previous prime is 21083263. The next prime is 21083267. The reversal of 21083264 is 46238012.

It can be written as a sum of positive squares in 2 ways, for example, as 20430400 + 652864 = 4520^2 + 808^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21083263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2669 + ... + 7020.

Almost surely, 2^21083264 is an apocalyptic number.

It is an amenable number.

21083264 is an abundant number, since it is smaller than the sum of its proper divisors (23393836).

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

21083264 is an equidigital number, since it uses as much as digits as its factorization.

21083264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9720 (or 9708 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21083264 is about 4591.6515547241. The cubic root of 21083264 is about 276.2565702115.

The spelling of 21083264 in words is "twenty-one million, eighty-three thousand, two hundred sixty-four".