21169264 has 10 divisors (see below), whose sum is σ = 41015480. Its totient is φ = 10584624.

The previous prime is 21169261. The next prime is 21169271. The reversal of 21169264 is 46296112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21169261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661524 + ... + 661555.

It is an arithmetic number, because the mean of its divisors is an integer number (4101548).

Almost surely, 2^21169264 is an apocalyptic number.

It is an amenable number.

21169264 is a deficient number, since it is larger than the sum of its proper divisors (19846216).

21169264 is a wasteful number, since it uses less digits than its factorization.

21169264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323087 (or 1323081 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21169264 is about 4601.0068463327. The cubic root of 21169264 is about 276.6316834527.

The spelling of 21169264 in words is "twenty-one million, one hundred sixty-nine thousand, two hundred sixty-four".