131220310321 has 2 divisors, whose sum is σ = 131220310322. Its totient is φ = 131220310320.

The previous prime is 131220310313. The next prime is 131220310339. The reversal of 131220310321 is 123013022131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95876310321 + 35344000000 = 309639^2 + 188000^2 .

It is an emirp because it is prime and its reverse (123013022131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131220310321 - 2³ = 131220310313 is a prime.

It is not a weakly prime, because it can be changed into another prime (131220310421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610155160 + 65610155161.

It is an arithmetic number, because the mean of its divisors is an integer number (65610155161).

Almost surely, 2^131220310321 is an apocalyptic number.

It is an amenable number.

131220310321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131220310321 is an equidigital number, since it uses as much as digits as its factorization.

131220310321 is an evil number, because the sum of its binary digits is even.

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

Adding to 131220310321 its reverse (123013022131), we get a palindrome (254233332452).

The spelling of 131220310321 in words is "one hundred thirty-one billion, two hundred twenty million, three hundred ten thousand, three hundred twenty-one".