31112213113021 has 6 divisors (see below), whose sum is σ = 31275957151166. Its totient is φ = 30949321908600.

The previous prime is 31112213112983. The next prime is 31112213113027. The reversal of 31112213113021 is 12031131221113.

It can be written as a sum of positive squares in only one way, i.e., 19089253265625 + 12022959847396 = 4369125^2 + 3467414^2 .

It is not a de Polignac number, because 31112213113021 - 2¹¹ = 31112213110973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31112213112983 and 31112213113001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112213113027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426380190 + ... + 426453151.

Almost surely, 2^{31112213113021} is an apocalyptic number.

It is an amenable number.

31112213113021 is a deficient number, since it is larger than the sum of its proper divisors (163744038145).

31112213113021 is an frugal number, since it uses more digits than its factorization.

31112213113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852833723 (or 852833532 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31112213113021 its reverse (12031131221113), we get a palindrome (43143344334134).

The spelling of 31112213113021 in words is "thirty-one trillion, one hundred twelve billion, two hundred thirteen million, one hundred thirteen thousand, twenty-one".