21888812 has 12 divisors (see below), whose sum is σ = 41787816. Its totient is φ = 9949440.

The previous prime is 21888787. The next prime is 21888827.

21888812 is nontrivially palindromic in base 10.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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, 248693 + ... + 248780.

It is an arithmetic number, because the mean of its divisors is an integer number (3482318).

Almost surely, 2^21888812 is an apocalyptic number.

21888812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21888812 is a deficient number, since it is larger than the sum of its proper divisors (19899004).

21888812 is a wasteful number, since it uses less digits than its factorization.

21888812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497488 (or 497486 counting only the distinct ones).

The product of its digits is 16384, while the sum is 38.

The square root of 21888812 is about 4678.5480653724. The cubic root of 21888812 is about 279.7310853519.

The spelling of 21888812 in words is "twenty-one million, eight hundred eighty-eight thousand, eight hundred twelve".