31211313012 has 120 divisors (see below), whose sum is σ = 89152997472. Its totient is φ = 9442785600.

The previous prime is 31211312981. The next prime is 31211313041. The reversal of 31211313012 is 21031311213.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2320587 + ... + 2333997.

Almost surely, 2^31211313012 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 31211313012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44576498736).

31211313012 is an abundant number, since it is smaller than the sum of its proper divisors (57941684460).

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

31211313012 is a wasteful number, since it uses less digits than its factorization.

31211313012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14091 (or 14080 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31211313012 its reverse (21031311213), we get a palindrome (52242624225).

The spelling of 31211313012 in words is "thirty-one billion, two hundred eleven million, three hundred thirteen thousand, twelve".