21133364 has 24 divisors (see below), whose sum is σ = 43411200. Its totient is φ = 8811936.

The previous prime is 21133309. The next prime is 21133381. The reversal of 21133364 is 46333112.

It is a congruent number.

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, 9164 + ... + 11235.

It is an arithmetic number, because the mean of its divisors is an integer number (1808800).

Almost surely, 2^21133364 is an apocalyptic number.

It is an amenable number.

21133364 is an abundant number, since it is smaller than the sum of its proper divisors (22277836).

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

21133364 is a wasteful number, since it uses less digits than its factorization.

21133364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20447 (or 20445 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

The square root of 21133364 is about 4597.1038709170. The cubic root of 21133364 is about 276.4752192409.

Adding to 21133364 its reverse (46333112), we get a palindrome (67466476).

The spelling of 21133364 in words is "twenty-one million, one hundred thirty-three thousand, three hundred sixty-four".