21902160 has 80 divisors (see below), whose sum is σ = 77602176. Its totient is φ = 5005824.

The previous prime is 21902143. The next prime is 21902173. The reversal of 21902160 is 6120912.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21902160² = 959409225331200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4839 + ... + 8198.

Almost surely, 2^21902160 is an apocalyptic number.

21902160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21902160 is an abundant number, since it is smaller than the sum of its proper divisors (55700016).

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

21902160 is a wasteful number, since it uses less digits than its factorization.

21902160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13060 (or 13054 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21902160 is about 4679.9743589041. The cubic root of 21902160 is about 279.7879346654.

The spelling of 21902160 in words is "twenty-one million, nine hundred two thousand, one hundred sixty".