21130320120 has 384 divisors, whose sum is σ = 79561958400. Its totient is φ = 4395036672.

The previous prime is 21130320061. The next prime is 21130320143. The reversal of 21130320120 is 2102303112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21130320120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10362061 + ... + 10364099.

It is an arithmetic number, because the mean of its divisors is an integer number (207192600).

Almost surely, 2^21130320120 is an apocalyptic number.

21130320120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130320120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39780979200).

21130320120 is an abundant number, since it is smaller than the sum of its proper divisors (58431638280).

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

21130320120 is a wasteful number, since it uses less digits than its factorization.

21130320120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159 (or 2142 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21130320120 its reverse (2102303112), we get a palindrome (23232623232).

The spelling of 21130320120 in words is "twenty-one billion, one hundred thirty million, three hundred twenty thousand, one hundred twenty".