21869168 has 20 divisors (see below), whose sum is σ = 42445200. Its totient is φ = 10915584.

The previous prime is 21869153. The next prime is 21869201. The reversal of 21869168 is 86196812.

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, 14933 + ... + 16331.

It is an arithmetic number, because the mean of its divisors is an integer number (2122260).

Almost surely, 2^21869168 is an apocalyptic number.

It is an amenable number.

21869168 is a deficient number, since it is larger than the sum of its proper divisors (20576032).

21869168 is a wasteful number, since it uses less digits than its factorization.

21869168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2378 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 21869168 is about 4676.4482248818. The cubic root of 21869168 is about 279.6473792392.

The spelling of 21869168 in words is "twenty-one million, eight hundred sixty-nine thousand, one hundred sixty-eight".