21963372 has 24 divisors (see below), whose sum is σ = 52498992. Its totient is φ = 7142400.

The previous prime is 21963341. The next prime is 21963379. The reversal of 21963372 is 27336912.

It is a happy number.

It is a super-2 number, since 2×21963372² = 964779419220768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21963379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21829 + ... + 22812.

It is an arithmetic number, because the mean of its divisors is an integer number (2187458).

Almost surely, 2^21963372 is an apocalyptic number.

It is an amenable number.

21963372 is an abundant number, since it is smaller than the sum of its proper divisors (30535620).

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

21963372 is a wasteful number, since it uses less digits than its factorization.

21963372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44689 (or 44687 counting only the distinct ones).

The product of its digits is 13608, while the sum is 33.

The square root of 21963372 is about 4686.5095753663. The cubic root of 21963372 is about 280.0483419934.

The spelling of 21963372 in words is "twenty-one million, nine hundred sixty-three thousand, three hundred seventy-two".