21312332320 has 48 divisors (see below), whose sum is σ = 50371310808. Its totient is φ = 8521390080.

The previous prime is 21312332309. The next prime is 21312332333. The reversal of 21312332320 is 2323321312.

It can be written as a sum of positive squares in 4 ways, for example, as 2607940624 + 18704391696 = 51068^2 + 136764^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21312332291 and 21312332300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376942 + ... + 429778.

Almost surely, 2^21312332320 is an apocalyptic number.

21312332320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312332320 is an abundant number, since it is smaller than the sum of its proper divisors (29058978488).

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

21312332320 is a wasteful number, since it uses less digits than its factorization.

21312332320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55373 (or 55365 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21312332320 its reverse (2323321312), we get a palindrome (23635653632).

The spelling of 21312332320 in words is "twenty-one billion, three hundred twelve million, three hundred thirty-two thousand, three hundred twenty".