21996361824 has 36 divisors (see below), whose sum is σ = 57744264564. Its totient is φ = 7331636224.

The previous prime is 21996361819. The next prime is 21996361843. The reversal of 21996361824 is 42816369912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1445584 + ... + 1460720.

It is an arithmetic number, because the mean of its divisors is an integer number (1604007349).

Almost surely, 2^21996361824 is an apocalyptic number.

21996361824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21996361824 is an abundant number, since it is smaller than the sum of its proper divisors (35747902740).

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

21996361824 is an frugal number, since it uses more digits than its factorization.

21996361824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30287 (or 15142 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The spelling of 21996361824 in words is "twenty-one billion, nine hundred ninety-six million, three hundred sixty-one thousand, eight hundred twenty-four".