21533368 has 16 divisors (see below), whose sum is σ = 41314680. Its totient is φ = 10516128.

The previous prime is 21533363. The next prime is 21533431. The reversal of 21533368 is 86333512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533363) 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, 30955 + ... + 31642.

Almost surely, 2^21533368 is an apocalyptic number.

It is an amenable number.

21533368 is a deficient number, since it is larger than the sum of its proper divisors (19781312).

21533368 is a wasteful number, since it uses less digits than its factorization.

21533368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62646 (or 62642 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 21533368 is about 4640.4060167188. The cubic root of 21533368 is about 278.2086662062.

The spelling of 21533368 in words is "twenty-one million, five hundred thirty-three thousand, three hundred sixty-eight".