21888056 has 32 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 10604256.

The previous prime is 21888023. The next prime is 21888071. The reversal of 21888056 is 65088812.

It is a congruent number.

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, 36995 + ... + 37581.

It is an arithmetic number, because the mean of its divisors is an integer number (1323000).

Almost surely, 2^21888056 is an apocalyptic number.

It is an amenable number.

21888056 is a deficient number, since it is larger than the sum of its proper divisors (20447944).

21888056 is a wasteful number, since it uses less digits than its factorization.

21888056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 21888056 is about 4678.4672703782. The cubic root of 21888056 is about 279.7278648462.

The spelling of 21888056 in words is "twenty-one million, eight hundred eighty-eight thousand, fifty-six".