31440212112 has 80 divisors (see below), whose sum is σ = 84795429888. Its totient is φ = 10019264640.

The previous prime is 31440212071. The next prime is 31440212137. The reversal of 31440212112 is 21121204413.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2545183 + ... + 2557505.

Almost surely, 2^31440212112 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 31440212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42397714944).

31440212112 is an abundant number, since it is smaller than the sum of its proper divisors (53355217776).

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

31440212112 is a wasteful number, since it uses less digits than its factorization.

31440212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14668 (or 14662 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 31440212112 its reverse (21121204413), we get a palindrome (52561416525).

The spelling of 31440212112 in words is "thirty-one billion, four hundred forty million, two hundred twelve thousand, one hundred twelve".