21929088 has 32 divisors (see below), whose sum is σ = 58250160. Its totient is φ = 7309568.

The previous prime is 21929087. The next prime is 21929101. The reversal of 21929088 is 88092912.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21929087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28170 + ... + 28937.

Almost surely, 2^21929088 is an apocalyptic number.

It is an amenable number.

21929088 is an abundant number, since it is smaller than the sum of its proper divisors (36321072).

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

21929088 is an equidigital number, since it uses as much as digits as its factorization.

21929088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57124 (or 57112 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 21929088 is about 4682.8504140107. The cubic root of 21929088 is about 279.9025511226.

The spelling of 21929088 in words is "twenty-one million, nine hundred twenty-nine thousand, eighty-eight".