21080568 has 32 divisors (see below), whose sum is σ = 52814160. Its totient is φ = 7011840.

The previous prime is 21080537. The next prime is 21080573. The reversal of 21080568 is 86508012.

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, 20646 + ... + 21642.

Almost surely, 2^21080568 is an apocalyptic number.

It is an amenable number.

21080568 is an abundant number, since it is smaller than the sum of its proper divisors (31733592).

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

21080568 is a wasteful number, since it uses less digits than its factorization.

21080568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887 (or 1883 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 21080568 is about 4591.3579690545. The cubic root of 21080568 is about 276.2447943710.

The spelling of 21080568 in words is "twenty-one million, eighty thousand, five hundred sixty-eight".