21312320120 has 64 divisors (see below), whose sum is σ = 59018742720. Its totient is φ = 6744996864.

The previous prime is 21312320111. The next prime is 21312320123. The reversal of 21312320120 is 2102321312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312320123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2923877 + ... + 2931156.

It is an arithmetic number, because the mean of its divisors is an integer number (922167855).

Almost surely, 2^21312320120 is an apocalyptic number.

21312320120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312320120 is an abundant number, since it is smaller than the sum of its proper divisors (37706422600).

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

21312320120 is a wasteful number, since it uses less digits than its factorization.

21312320120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855064 (or 5855060 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21312320120 its reverse (2102321312), we get a palindrome (23414641432).

The spelling of 21312320120 in words is "twenty-one billion, three hundred twelve million, three hundred twenty thousand, one hundred twenty".