31312441130221 has 2 divisors, whose sum is σ = 31312441130222. Its totient is φ = 31312441130220.

The previous prime is 31312441130171. The next prime is 31312441130273. The reversal of 31312441130221 is 12203114421313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19761483361321 + 11550957768900 = 4445389^2 + 3398670^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312441130221 - 2¹⁵ = 31312441097453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31312441130221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31312441130021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656220565110 + 15656220565111.

It is an arithmetic number, because the mean of its divisors is an integer number (15656220565111).

Almost surely, 2^{31312441130221} is an apocalyptic number.

It is an amenable number.

31312441130221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312441130221 is an equidigital number, since it uses as much as digits as its factorization.

31312441130221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 31312441130221 its reverse (12203114421313), we get a palindrome (43515555551534).

The spelling of 31312441130221 in words is "thirty-one trillion, three hundred twelve billion, four hundred forty-one million, one hundred thirty thousand, two hundred twenty-one".