31312232113021 has 2 divisors, whose sum is σ = 31312232113022. Its totient is φ = 31312232113020.

The previous prime is 31312232113009. The next prime is 31312232113133. The reversal of 31312232113021 is 12031123221313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30999717572121 + 312514540900 = 5567739^2 + 559030^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312232113021 - 2¹⁹ = 31312231588733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31312232111021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656116056510 + 15656116056511.

It is an arithmetic number, because the mean of its divisors is an integer number (15656116056511).

Almost surely, 2^{31312232113021} is an apocalyptic number.

It is an amenable number.

31312232113021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312232113021 is an equidigital number, since it uses as much as digits as its factorization.

31312232113021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31312232113021 its reverse (12031123221313), we get a palindrome (43343355334334).

The spelling of 31312232113021 in words is "thirty-one trillion, three hundred twelve billion, two hundred thirty-two million, one hundred thirteen thousand, twenty-one".