131230312021 has 2 divisors, whose sum is σ = 131230312022. Its totient is φ = 131230312020.

The previous prime is 131230312007. The next prime is 131230312027. The reversal of 131230312021 is 120213032131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69371658225 + 61858653796 = 263385^2 + 248714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131230312021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131230312021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131230312027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65615156010 + 65615156011.

It is an arithmetic number, because the mean of its divisors is an integer number (65615156011).

Almost surely, 2^131230312021 is an apocalyptic number.

It is an amenable number.

131230312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131230312021 is an equidigital number, since it uses as much as digits as its factorization.

131230312021 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 131230312021 its reverse (120213032131), we get a palindrome (251443344152).

The spelling of 131230312021 in words is "one hundred thirty-one billion, two hundred thirty million, three hundred twelve thousand, twenty-one".