31021311112 has 96 divisors (see below), whose sum is σ = 65535845760. Its totient is φ = 13749436800.

The previous prime is 31021311067. The next prime is 31021311149. The reversal of 31021311112 is 21111312013.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13966162 + ... + 13968382.

It is an arithmetic number, because the mean of its divisors is an integer number (682665060).

Almost surely, 2^31021311112 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 31021311112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32767922880).

31021311112 is an abundant number, since it is smaller than the sum of its proper divisors (34514534648).

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

31021311112 is a wasteful number, since it uses less digits than its factorization.

31021311112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603 (or 2588 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 31021311112 its reverse (21111312013), we get a palindrome (52132623125).

Subtracting from 31021311112 its reverse (21111312013), we obtain a palindrome (9909999099).

The spelling of 31021311112 in words is "thirty-one billion, twenty-one million, three hundred eleven thousand, one hundred twelve".