31213302012 has 72 divisors (see below), whose sum is σ = 80057813472. Its totient is φ = 10251964800.

The previous prime is 31213302007. The next prime is 31213302053. The reversal of 31213302012 is 21020331213.

31213302012 is a `hidden beast` number, since 312 + 1 + 330 + 20 + 1 + 2 = 666.

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 23 ways as a sum of consecutive naturals, for example, 7760562 + ... + 7764582.

It is an arithmetic number, because the mean of its divisors is an integer number (1111914076).

Almost surely, 2^31213302012 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 31213302012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40028906736).

31213302012 is an abundant number, since it is smaller than the sum of its proper divisors (48844511460).

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

31213302012 is a wasteful number, since it uses less digits than its factorization.

31213302012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139 (or 7134 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31213302012 its reverse (21020331213), we get a palindrome (52233633225).

The spelling of 31213302012 in words is "thirty-one billion, two hundred thirteen million, three hundred two thousand, twelve".