31333231213212 has 96 divisors (see below), whose sum is σ = 78188584690944. Its totient is φ = 9731383936000.

The previous prime is 31333231213153. The next prime is 31333231213247. The reversal of 31333231213212 is 21231213233313.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31333231213212.

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, 157376887 + ... + 157575857.

It is an arithmetic number, because the mean of its divisors is an integer number (814464423864).

Almost surely, 2^{31333231213212} 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 31333231213212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39094292345472).

31333231213212 is an abundant number, since it is smaller than the sum of its proper divisors (46855353477732).

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

31333231213212 is a wasteful number, since it uses less digits than its factorization.

31333231213212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206739 (or 206737 counting only the distinct ones).

The product of its digits is 11664, while the sum is 30.

Adding to 31333231213212 its reverse (21231213233313), we get a palindrome (52564444446525).

The spelling of 31333231213212 in words is "thirty-one trillion, three hundred thirty-three billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred twelve".