21872672 has 24 divisors (see below), whose sum is σ = 43981056. Its totient is φ = 10702912.

The previous prime is 21872663. The next prime is 21872689. The reversal of 21872672 is 27627812.

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, 5768 + ... + 8775.

It is an arithmetic number, because the mean of its divisors is an integer number (1832544).

Almost surely, 2^21872672 is an apocalyptic number.

It is an amenable number.

21872672 is an abundant number, since it is smaller than the sum of its proper divisors (22108384).

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

21872672 is a wasteful number, since it uses less digits than its factorization.

21872672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14600 (or 14592 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 21872672 is about 4676.8228531771. The cubic root of 21872672 is about 279.6623139956.

The spelling of 21872672 in words is "twenty-one million, eight hundred seventy-two thousand, six hundred seventy-two".