21907190 has 16 divisors (see below), whose sum is σ = 41508720. Its totient is φ = 8301600.

The previous prime is 21907189. The next prime is 21907229. The reversal of 21907190 is 9170912.

It is a super-2 number, since 2×21907190² = 959849947392200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57461 + ... + 57840.

It is an arithmetic number, because the mean of its divisors is an integer number (2594295).

Almost surely, 2^21907190 is an apocalyptic number.

21907190 is a deficient number, since it is larger than the sum of its proper divisors (19601530).

21907190 is a wasteful number, since it uses less digits than its factorization.

21907190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115327.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 21907190 is about 4680.5117241601. The cubic root of 21907190 is about 279.8093515118.

The spelling of 21907190 in words is "twenty-one million, nine hundred seven thousand, one hundred ninety".