21907912 has 32 divisors (see below), whose sum is σ = 46569600. Its totient is φ = 9578304.

The previous prime is 21907909. The next prime is 21907913. The reversal of 21907912 is 21970912.

It is not an unprimeable number, because it can be changed into a prime (21907913) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3568 + ... + 7519.

It is an arithmetic number, because the mean of its divisors is an integer number (1455300).

Almost surely, 2^21907912 is an apocalyptic number.

It is an amenable number.

21907912 is an abundant number, since it is smaller than the sum of its proper divisors (24661688).

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

21907912 is a wasteful number, since it uses less digits than its factorization.

21907912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11125 (or 11121 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 21907912 is about 4680.5888518433. The cubic root of 21907912 is about 279.8124253905.

The spelling of 21907912 in words is "twenty-one million, nine hundred seven thousand, nine hundred twelve".