131521430321 has 2 divisors, whose sum is σ = 131521430322. Its totient is φ = 131521430320.

The previous prime is 131521430309. The next prime is 131521430323. The reversal of 131521430321 is 123034125131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94691598400 + 36829831921 = 307720^2 + 191911^2 .

It is a cyclic number.

It is not a de Polignac number, because 131521430321 - 2¹⁰ = 131521429297 is a prime.

Together with 131521430323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131521430323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65760715160 + 65760715161.

It is an arithmetic number, because the mean of its divisors is an integer number (65760715161).

Almost surely, 2^131521430321 is an apocalyptic number.

It is an amenable number.

131521430321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131521430321 is an equidigital number, since it uses as much as digits as its factorization.

131521430321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 131521430321 its reverse (123034125131), we get a palindrome (254555555452).

The spelling of 131521430321 in words is "one hundred thirty-one billion, five hundred twenty-one million, four hundred thirty thousand, three hundred twenty-one".