21888882 has 24 divisors (see below), whose sum is σ = 48232080. Its totient is φ = 7172280.

The previous prime is 21888871. The next prime is 21888899. The reversal of 21888882 is 28888812.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9244 + ... + 11367.

It is an arithmetic number, because the mean of its divisors is an integer number (2009670).

Almost surely, 2^21888882 is an apocalyptic number.

21888882 is an abundant number, since it is smaller than the sum of its proper divisors (26343198).

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

21888882 is a wasteful number, since it uses less digits than its factorization.

21888882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20678 (or 20675 counting only the distinct ones).

The product of its digits is 131072, while the sum is 45.

The square root of 21888882 is about 4678.5555463198. Note that the first 4 decimals coincide. The cubic root of 21888882 is about 279.7313835432.

The spelling of 21888882 in words is "twenty-one million, eight hundred eighty-eight thousand, eight hundred eighty-two".