21322872 has 32 divisors (see below), whose sum is σ = 59230800. Its totient is φ = 7107552.

The previous prime is 21322871. The next prime is 21322891. The reversal of 21322872 is 27822312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49143 + ... + 49574.

Almost surely, 2^21322872 is an apocalyptic number.

It is an amenable number.

21322872 is an abundant number, since it is smaller than the sum of its proper divisors (37907928).

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

21322872 is a wasteful number, since it uses less digits than its factorization.

21322872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98732 (or 98722 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21322872 is about 4617.6695420959. The cubic root of 21322872 is about 277.2991680566.

The spelling of 21322872 in words is "twenty-one million, three hundred twenty-two thousand, eight hundred seventy-two".