21488568 has 16 divisors (see below), whose sum is σ = 53721480. Its totient is φ = 7162848.

The previous prime is 21488557. The next prime is 21488573. The reversal of 21488568 is 86588412.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447655 + ... + 447702.

Almost surely, 2^21488568 is an apocalyptic number.

It is an amenable number.

21488568 is an abundant number, since it is smaller than the sum of its proper divisors (32232912).

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

21488568 is a wasteful number, since it uses less digits than its factorization.

21488568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895366 (or 895362 counting only the distinct ones).

The product of its digits is 122880, while the sum is 42.

The square root of 21488568 is about 4635.5763395720. The cubic root of 21488568 is about 278.0155952813.

The spelling of 21488568 in words is "twenty-one million, four hundred eighty-eight thousand, five hundred sixty-eight".