21313031120 has 40 divisors (see below), whose sum is σ = 52160843040. Its totient is φ = 8076516480.

The previous prime is 21313031119. The next prime is 21313031137. The reversal of 21313031120 is 2113031312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7009346 + ... + 7012385.

It is an arithmetic number, because the mean of its divisors is an integer number (1304021076).

Almost surely, 2^21313031120 is an apocalyptic number.

21313031120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313031120 is an abundant number, since it is smaller than the sum of its proper divisors (30847811920).

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

21313031120 is a wasteful number, since it uses less digits than its factorization.

21313031120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14021763 (or 14021757 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21313031120 its reverse (2113031312), we get a palindrome (23426062432).

The spelling of 21313031120 in words is "twenty-one billion, three hundred thirteen million, thirty-one thousand, one hundred twenty".