231130320340021 has 2 divisors, whose sum is σ = 231130320340022. Its totient is φ = 231130320340020.

The previous prime is 231130320340009. The next prime is 231130320340027. The reversal of 231130320340021 is 120043023031132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231069944970225 + 60375369796 = 15200985^2 + 245714^2 .

It is a cyclic number.

It is not a de Polignac number, because 231130320340021 - 2⁹ = 231130320339509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231130320340027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115565160170010 + 115565160170011.

It is an arithmetic number, because the mean of its divisors is an integer number (115565160170011).

Almost surely, 2^{231130320340021} is an apocalyptic number.

It is an amenable number.

231130320340021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231130320340021 is an equidigital number, since it uses as much as digits as its factorization.

231130320340021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 231130320340021 its reverse (120043023031132), we get a palindrome (351173343371153).

The spelling of 231130320340021 in words is "two hundred thirty-one trillion, one hundred thirty billion, three hundred twenty million, three hundred forty thousand, twenty-one".