31212031121012 has 96 divisors (see below), whose sum is σ = 65917253907456. Its totient is φ = 12650755737600.

The previous prime is 31212031120979. The next prime is 31212031121059. The reversal of 31212031121012 is 21012113021213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10155248 + ... + 12866744.

It is an arithmetic number, because the mean of its divisors is an integer number (686638061536).

Almost surely, 2^{31212031121012} 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 31212031121012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32958626953728).

31212031121012 is an abundant number, since it is smaller than the sum of its proper divisors (34705222786444).

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

31212031121012 is a wasteful number, since it uses less digits than its factorization.

31212031121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2711857 (or 2711855 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31212031121012 its reverse (21012113021213), we get a palindrome (52224144142225).

The spelling of 31212031121012 in words is "thirty-one trillion, two hundred twelve billion, thirty-one million, one hundred twenty-one thousand, twelve".