31212111112 has 128 divisors (see below), whose sum is σ = 76721299200. Its totient is φ = 11620537344.

The previous prime is 31212111101. The next prime is 31212111113. The reversal of 31212111112 is 21111121213.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31212111113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2084083 + ... + 2099005.

It is an arithmetic number, because the mean of its divisors is an integer number (599385150).

Almost surely, 2^31212111112 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 31212111112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38360649600).

31212111112 is an abundant number, since it is smaller than the sum of its proper divisors (45509188088).

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

31212111112 is a wasteful number, since it uses less digits than its factorization.

31212111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14992 (or 14962 counting only the distinct ones).

The product of its digits is 24, while the sum is 16.

Adding to 31212111112 its reverse (21111121213), we get a palindrome (52323232325).

The spelling of 31212111112 in words is "thirty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred twelve".