21582518944 has 24 divisors (see below), whose sum is σ = 48560668128. Its totient is φ = 9249650880.

The previous prime is 21582518933. The next prime is 21582518953. The reversal of 21582518944 is 44981528512.

It is a happy number.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48175042 + ... + 48175489.

It is an arithmetic number, because the mean of its divisors is an integer number (2023361172).

Almost surely, 2^21582518944 is an apocalyptic number.

It is an amenable number.

21582518944 is an abundant number, since it is smaller than the sum of its proper divisors (26978149184).

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

21582518944 is an equidigital number, since it uses as much as digits as its factorization.

21582518944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96350548 (or 96350540 counting only the distinct ones).

The product of its digits is 921600, while the sum is 49.

The spelling of 21582518944 in words is "twenty-one billion, five hundred eighty-two million, five hundred eighteen thousand, nine hundred forty-four".