31213232971228 has 36 divisors (see below), whose sum is σ = 68617520423536. Its totient is φ = 12160999857600.

The previous prime is 31213232971163. The next prime is 31213232971229. The reversal of 31213232971228 is 82217923231213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213232971229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4606435953 + ... + 4606442728.

Almost surely, 2^{31213232971228} is an apocalyptic number.

It is an amenable number.

31213232971228 is an abundant number, since it is smaller than the sum of its proper divisors (37404287452308).

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

31213232971228 is a wasteful number, since it uses less digits than its factorization.

31213232971228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9212878714 (or 9212878701 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The spelling of 31213232971228 in words is "thirty-one trillion, two hundred thirteen billion, two hundred thirty-two million, nine hundred seventy-one thousand, two hundred twenty-eight".