3131311221212 has 48 divisors (see below), whose sum is σ = 5781135360000. Its totient is φ = 1479929149440.

The previous prime is 3131311221211. The next prime is 3131311221217. The reversal of 3131311221212 is 2121221131313.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131311221211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232960412 + ... + 232973852.

It is an arithmetic number, because the mean of its divisors is an integer number (120440320000).

Almost surely, 2^{3131311221212} is an apocalyptic number.

It is an amenable number.

3131311221212 is a deficient number, since it is larger than the sum of its proper divisors (2649824138788).

3131311221212 is a wasteful number, since it uses less digits than its factorization.

3131311221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20106 (or 20104 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

Adding to 3131311221212 its reverse (2121221131313), we get a palindrome (5252532352525).

The spelling of 3131311221212 in words is "three trillion, one hundred thirty-one billion, three hundred eleven million, two hundred twenty-one thousand, two hundred twelve".