31030012120 has 32 divisors (see below), whose sum is σ = 69825600000. Its totient is φ = 12410569728.

The previous prime is 31030012109. The next prime is 31030012183. The reversal of 31030012120 is 2121003013.

It is a self number, because there is not a number n which added to its sum of digits gives 31030012120.

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, 347881 + ... + 427879.

It is an arithmetic number, because the mean of its divisors is an integer number (2182050000).

Almost surely, 2^31030012120 is an apocalyptic number.

It is an amenable number.

31030012120 is an abundant number, since it is smaller than the sum of its proper divisors (38795587880).

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

31030012120 is a wasteful number, since it uses less digits than its factorization.

31030012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89707 (or 89703 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31030012120 its reverse (2121003013), we get a palindrome (33151015133).

The spelling of 31030012120 in words is "thirty-one billion, thirty million, twelve thousand, one hundred twenty".