21867568 has 20 divisors (see below), whose sum is σ = 42695928. Its totient is φ = 10849280.

The previous prime is 21867553. The next prime is 21867581. The reversal of 21867568 is 86576812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3121 + ... + 7312.

Almost surely, 2^21867568 is an apocalyptic number.

It is an amenable number.

21867568 is a deficient number, since it is larger than the sum of its proper divisors (20828360).

21867568 is a wasteful number, since it uses less digits than its factorization.

21867568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10572 (or 10566 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 21867568 is about 4676.2771517522. The cubic root of 21867568 is about 279.6405591853.

The spelling of 21867568 in words is "twenty-one million, eight hundred sixty-seven thousand, five hundred sixty-eight".