231310130221 has 2 divisors, whose sum is σ = 231310130222. Its totient is φ = 231310130220.

The previous prime is 231310130189. The next prime is 231310130231. The reversal of 231310130221 is 122031013132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212165256996 + 19144873225 = 460614^2 + 138365^2 .

It is a cyclic number.

It is not a de Polignac number, because 231310130221 - 2⁵ = 231310130189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231310130231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655065110 + 115655065111.

It is an arithmetic number, because the mean of its divisors is an integer number (115655065111).

Almost surely, 2^231310130221 is an apocalyptic number.

It is an amenable number.

231310130221 is a deficient number, since it is larger than the sum of its proper divisors (1).

231310130221 is an equidigital number, since it uses as much as digits as its factorization.

231310130221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 231310130221 its reverse (122031013132), we get a palindrome (353341143353).

The spelling of 231310130221 in words is "two hundred thirty-one billion, three hundred ten million, one hundred thirty thousand, two hundred twenty-one".