21722944 has 28 divisors (see below), whose sum is σ = 43452288. Its totient is φ = 10774400.

The previous prime is 21722933. The next prime is 21722963. The reversal of 21722944 is 44922712.

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, 7089 + ... + 9679.

Almost surely, 2^21722944 is an apocalyptic number.

It is an amenable number.

21722944 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21722944 is a wasteful number, since it uses less digits than its factorization.

21722944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734 (or 2724 counting only the distinct ones).

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

The square root of 21722944 is about 4660.7879162219. The cubic root of 21722944 is about 279.0227153989.

The spelling of 21722944 in words is "twenty-one million, seven hundred twenty-two thousand, nine hundred forty-four".