31221133130189 has 2 divisors, whose sum is σ = 31221133130190. Its totient is φ = 31221133130188.

The previous prime is 31221133130177. The next prime is 31221133130219. The reversal of 31221133130189 is 98103133112213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30025106553289 + 1196026576900 = 5479517^2 + 1093630^2 .

It is a cyclic number.

It is not a de Polignac number, because 31221133130189 - 2¹² = 31221133126093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31221133130689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610566565094 + 15610566565095.

It is an arithmetic number, because the mean of its divisors is an integer number (15610566565095).

Almost surely, 2^{31221133130189} is an apocalyptic number.

It is an amenable number.

31221133130189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221133130189 is an equidigital number, since it uses as much as digits as its factorization.

31221133130189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 31221133130189 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred thirty-three million, one hundred thirty thousand, one hundred eighty-nine".