21326872 has 16 divisors (see below), whose sum is σ = 45700560. Its totient is φ = 9140064.

The previous prime is 21326863. The next prime is 21326897. The reversal of 21326872 is 27862312.

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, 190363 + ... + 190474.

It is an arithmetic number, because the mean of its divisors is an integer number (2856285).

Almost surely, 2^21326872 is an apocalyptic number.

It is an amenable number.

21326872 is an abundant number, since it is smaller than the sum of its proper divisors (24373688).

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

21326872 is a wasteful number, since it uses less digits than its factorization.

21326872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380850 (or 380846 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 21326872 is about 4618.1026406956. The cubic root of 21326872 is about 277.3165066735.

The spelling of 21326872 in words is "twenty-one million, three hundred twenty-six thousand, eight hundred seventy-two".