21938272 has 24 divisors (see below), whose sum is σ = 43580376. Its totient is φ = 10870272.

The previous prime is 21938269. The next prime is 21938327. The reversal of 21938272 is 27283912.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

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, 583 + ... + 6649.

It is an arithmetic number, because the mean of its divisors is an integer number (1815849).

Almost surely, 2^21938272 is an apocalyptic number.

It is an amenable number.

21938272 is a deficient number, since it is larger than the sum of its proper divisors (21642104).

21938272 is a wasteful number, since it uses less digits than its factorization.

21938272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190 (or 6182 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 21938272 is about 4683.8309106969. The cubic root of 21938272 is about 279.9416204819.

The spelling of 21938272 in words is "twenty-one million, nine hundred thirty-eight thousand, two hundred seventy-two".