21133264 has 20 divisors (see below), whose sum is σ = 41136256. Its totient is φ = 10517472.

The previous prime is 21133243. The next prime is 21133283. The reversal of 21133264 is 46233112.

It is a super-2 number, since 2×21133264² = 893229694587392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607 + ... + 6529.

Almost surely, 2^21133264 is an apocalyptic number.

It is an amenable number.

21133264 is a deficient number, since it is larger than the sum of its proper divisors (20002992).

21133264 is a wasteful number, since it uses less digits than its factorization.

21133264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6154 (or 6148 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 21133264 is about 4597.0929944912. The cubic root of 21133264 is about 276.4747831601.

Adding to 21133264 its reverse (46233112), we get a palindrome (67366376).

The spelling of 21133264 in words is "twenty-one million, one hundred thirty-three thousand, two hundred sixty-four".