21967372 has 24 divisors (see below), whose sum is σ = 44495360. Its totient is φ = 9294480.

The previous prime is 21967343. The next prime is 21967397. The reversal of 21967372 is 27376912.

It is a plaindrome in base 11.

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 7 ways as a sum of consecutive naturals, for example, 2754 + ... + 7177.

Almost surely, 2^21967372 is an apocalyptic number.

It is an amenable number.

21967372 is an abundant number, since it is smaller than the sum of its proper divisors (22527988).

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

21967372 is a wasteful number, since it uses less digits than its factorization.

21967372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10021 (or 10019 counting only the distinct ones).

The product of its digits is 31752, while the sum is 37.

The square root of 21967372 is about 4686.9363127740. The cubic root of 21967372 is about 280.0653418932.

The spelling of 21967372 in words is "twenty-one million, nine hundred sixty-seven thousand, three hundred seventy-two".