31120212312 has 160 divisors (see below), whose sum is σ = 99832550400. Its totient is φ = 8872307136.

The previous prime is 31120212289. The next prime is 31120212379. The reversal of 31120212312 is 21321202113.

31120212312 is a `hidden beast` number, since 311 + 20 + 21 + 2 + 312 = 666.

It is a super-2 number, since 2×31120212312² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2165583 + ... + 2179905.

It is an arithmetic number, because the mean of its divisors is an integer number (623953440).

Almost surely, 2^31120212312 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 31120212312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49916275200).

31120212312 is an abundant number, since it is smaller than the sum of its proper divisors (68712338088).

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

31120212312 is a wasteful number, since it uses less digits than its factorization.

31120212312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14827 (or 14814 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31120212312 its reverse (21321202113), we get a palindrome (52441414425).

The spelling of 31120212312 in words is "thirty-one billion, one hundred twenty million, two hundred twelve thousand, three hundred twelve".