21192880 has 40 divisors (see below), whose sum is σ = 52175232. Its totient is φ = 7977984.

The previous prime is 21192877. The next prime is 21192887. The reversal of 21192880 is 8829112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21192887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6432 + ... + 9151.

Almost surely, 2^21192880 is an apocalyptic number.

21192880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21192880 is an abundant number, since it is smaller than the sum of its proper divisors (30982352).

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

21192880 is a wasteful number, since it uses less digits than its factorization.

21192880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15613 (or 15607 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 21192880 is about 4603.5725257674. The cubic root of 21192880 is about 276.7345134488.

The spelling of 21192880 in words is "twenty-one million, one hundred ninety-two thousand, eight hundred eighty".