21733564 has 6 divisors (see below), whose sum is σ = 38033744. Its totient is φ = 10866780.

The previous prime is 21733561. The next prime is 21733577. The reversal of 21733564 is 46533712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21733561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2716692 + ... + 2716699.

Almost surely, 2^21733564 is an apocalyptic number.

It is an amenable number.

21733564 is a deficient number, since it is larger than the sum of its proper divisors (16300180).

21733564 is a wasteful number, since it uses less digits than its factorization.

21733564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5433395 (or 5433393 counting only the distinct ones).

The product of its digits is 15120, while the sum is 31.

The square root of 21733564 is about 4661.9270693566. The cubic root of 21733564 is about 279.0681779059.

The spelling of 21733564 in words is "twenty-one million, seven hundred thirty-three thousand, five hundred sixty-four".