31112213120 has 128 divisors (see below), whose sum is σ = 76439436480. Its totient is φ = 12102451200.

The previous prime is 31112213113. The next prime is 31112213123. The reversal of 31112213120 is 2131221113.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (31112213123) 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, 6629975 + ... + 6634665.

Almost surely, 2^31112213120 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 31112213120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38219718240).

31112213120 is an abundant number, since it is smaller than the sum of its proper divisors (45327223360).

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

31112213120 is a wasteful number, since it uses less digits than its factorization.

31112213120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4994 (or 4982 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31112213120 its reverse (2131221113), we get a palindrome (33243434233).

The spelling of 31112213120 in words is "thirty-one billion, one hundred twelve million, two hundred thirteen thousand, one hundred twenty".