131302221521 has 2 divisors, whose sum is σ = 131302221522. Its totient is φ = 131302221520.

The previous prime is 131302221511. The next prime is 131302221529. The reversal of 131302221521 is 125122203131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130136955025 + 1165266496 = 360745^2 + 34136^2 .

It is a cyclic number.

It is not a de Polignac number, because 131302221521 - 2³⁰ = 130228479697 is a prime.

It is not a weakly prime, because it can be changed into another prime (131302221529) 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, 65651110760 + 65651110761.

It is an arithmetic number, because the mean of its divisors is an integer number (65651110761).

Almost surely, 2^131302221521 is an apocalyptic number.

It is an amenable number.

131302221521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131302221521 is an equidigital number, since it uses as much as digits as its factorization.

131302221521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 131302221521 its reverse (125122203131), we get a palindrome (256424424652).

The spelling of 131302221521 in words is "one hundred thirty-one billion, three hundred two million, two hundred twenty-one thousand, five hundred twenty-one".