21944568 has 16 divisors (see below), whose sum is σ = 54861480. Its totient is φ = 7314848.

The previous prime is 21944551. The next prime is 21944579. The reversal of 21944568 is 86544912.

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, 457155 + ... + 457202.

Almost surely, 2^21944568 is an apocalyptic number.

It is an amenable number.

21944568 is an abundant number, since it is smaller than the sum of its proper divisors (32916912).

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

21944568 is a wasteful number, since it uses less digits than its factorization.

21944568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914366 (or 914362 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 21944568 is about 4684.5029618947. The cubic root of 21944568 is about 279.9683977939.

The spelling of 21944568 in words is "twenty-one million, nine hundred forty-four thousand, five hundred sixty-eight".