21824964 has 60 divisors (see below), whose sum is σ = 65212224. Its totient is φ = 6235056.

The previous prime is 21824963. The next prime is 21824969. The reversal of 21824964 is 46942812.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21824963) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2544 + ... + 7079.

Almost surely, 2^21824964 is an apocalyptic number.

It is an amenable number.

21824964 is an abundant number, since it is smaller than the sum of its proper divisors (43387260).

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

21824964 is a wasteful number, since it uses less digits than its factorization.

21824964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9646 (or 9635 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21824964 is about 4671.7195977498. The cubic root of 21824964 is about 279.4588357019.

The spelling of 21824964 in words is "twenty-one million, eight hundred twenty-four thousand, nine hundred sixty-four".