21023231320 has 64 divisors (see below), whose sum is σ = 58218189120. Its totient is φ = 6653505024.

The previous prime is 21023231311. The next prime is 21023231353. The reversal of 21023231320 is 2313232012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2884167 + ... + 2891446.

It is an arithmetic number, because the mean of its divisors is an integer number (909659205).

Almost surely, 2^21023231320 is an apocalyptic number.

21023231320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023231320 is an abundant number, since it is smaller than the sum of its proper divisors (37194957800).

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

21023231320 is a wasteful number, since it uses less digits than its factorization.

21023231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5775644 (or 5775640 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21023231320 its reverse (2313232012), we get a palindrome (23336463332).

The spelling of 21023231320 in words is "twenty-one billion, twenty-three million, two hundred thirty-one thousand, three hundred twenty".