21772372 has 12 divisors (see below), whose sum is σ = 38402560. Its totient is φ = 10800216.

The previous prime is 21772369. The next prime is 21772379. The reversal of 21772372 is 27327712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21772379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20922 + ... + 21937.

Almost surely, 2^21772372 is an apocalyptic number.

It is an amenable number.

21772372 is a deficient number, since it is larger than the sum of its proper divisors (16630188).

21772372 is a wasteful number, since it uses less digits than its factorization.

21772372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42990 (or 42988 counting only the distinct ones).

The product of its digits is 8232, while the sum is 31.

The square root of 21772372 is about 4666.0874402437. The cubic root of 21772372 is about 279.2341828630.

The spelling of 21772372 in words is "twenty-one million, seven hundred seventy-two thousand, three hundred seventy-two".