21136944 has 40 divisors (see below), whose sum is σ = 54840240. Its totient is φ = 7015168.

The previous prime is 21136937. The next prime is 21136963. The reversal of 21136944 is 44963112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12094 + ... + 13730.

It is an arithmetic number, because the mean of its divisors is an integer number (1371006).

Almost surely, 2^21136944 is an apocalyptic number.

21136944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21136944 is an abundant number, since it is smaller than the sum of its proper divisors (33703296).

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

21136944 is a wasteful number, since it uses less digits than its factorization.

21136944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1911 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 21136944 is about 4597.4932300113. The cubic root of 21136944 is about 276.4908300290.

The spelling of 21136944 in words is "twenty-one million, one hundred thirty-six thousand, nine hundred forty-four".