21333252320 has 48 divisors (see below), whose sum is σ = 50898855168. Its totient is φ = 8448806400.

The previous prime is 21333252293. The next prime is 21333252329. The reversal of 21333252320 is 2325233312.

It is a self number, because there is not a number n which added to its sum of digits gives 21333252320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333252329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643904 + ... + 676223.

It is an arithmetic number, because the mean of its divisors is an integer number (1060392816).

Almost surely, 2^21333252320 is an apocalyptic number.

21333252320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21333252320 is an abundant number, since it is smaller than the sum of its proper divisors (29565602848).

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

21333252320 is a wasteful number, since it uses less digits than its factorization.

21333252320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320243 (or 1320235 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 21333252320 its reverse (2325233312), we get a palindrome (23658485632).

The spelling of 21333252320 in words is "twenty-one billion, three hundred thirty-three million, two hundred fifty-two thousand, three hundred twenty".