21333997024 has 48 divisors (see below), whose sum is σ = 43849384992. Its totient is φ = 10198110208.

The previous prime is 21333997021. The next prime is 21333997037. The reversal of 21333997024 is 42079933312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333997021) 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, 1755192 + ... + 1767304.

It is an arithmetic number, because the mean of its divisors is an integer number (913528854).

Almost surely, 2^21333997024 is an apocalyptic number.

It is an amenable number.

21333997024 is an abundant number, since it is smaller than the sum of its proper divisors (22515387968).

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

21333997024 is a wasteful number, since it uses less digits than its factorization.

21333997024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14539 (or 14531 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 43.

The spelling of 21333997024 in words is "twenty-one billion, three hundred thirty-three million, nine hundred ninety-seven thousand, twenty-four".