21276264 has 16 divisors (see below), whose sum is σ = 53190720. Its totient is φ = 7092080.

The previous prime is 21276263. The next prime is 21276287. The reversal of 21276264 is 46267212.

It is not an unprimeable number, because it can be changed into a prime (21276263) 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, 443232 + ... + 443279.

It is an arithmetic number, because the mean of its divisors is an integer number (3324420).

Almost surely, 2^21276264 is an apocalyptic number.

21276264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21276264 is an abundant number, since it is smaller than the sum of its proper divisors (31914456).

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

21276264 is a wasteful number, since it uses less digits than its factorization.

21276264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886520 (or 886516 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 21276264 is about 4612.6200797378. The cubic root of 21276264 is about 277.0969784726.

The spelling of 21276264 in words is "twenty-one million, two hundred seventy-six thousand, two hundred sixty-four".