31032120112 has 80 divisors (see below), whose sum is σ = 69318063360. Its totient is φ = 13182983424.

The previous prime is 31032119971. The next prime is 31032120149. The reversal of 31032120112 is 21102123013.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 8209839 + ... + 8213617.

It is an arithmetic number, because the mean of its divisors is an integer number (866475792).

Almost surely, 2^31032120112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31032120112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34659031680).

31032120112 is an abundant number, since it is smaller than the sum of its proper divisors (38285943248).

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

31032120112 is a wasteful number, since it uses less digits than its factorization.

31032120112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4418 (or 4412 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31032120112 its reverse (21102123013), we get a palindrome (52134243125).

The spelling of 31032120112 in words is "thirty-one billion, thirty-two million, one hundred twenty thousand, one hundred twelve".