21713944 has 16 divisors (see below), whose sum is σ = 46530000. Its totient is φ = 9305952.

The previous prime is 21713929. The next prime is 21713957. The reversal of 21713944 is 44931712.

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, 193819 + ... + 193930.

It is an arithmetic number, because the mean of its divisors is an integer number (2908125).

Almost surely, 2^21713944 is an apocalyptic number.

It is an amenable number.

21713944 is an abundant number, since it is smaller than the sum of its proper divisors (24816056).

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

21713944 is a wasteful number, since it uses less digits than its factorization.

21713944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387762 (or 387758 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 21713944 is about 4659.8223142090. The cubic root of 21713944 is about 278.9841762500.

It can be divided in two parts, 217 and 13944, that added together give a square (14161 = 119²).

The spelling of 21713944 in words is "twenty-one million, seven hundred thirteen thousand, nine hundred forty-four".