321220310113 has 2 divisors, whose sum is σ = 321220310114. Its totient is φ = 321220310112.

The previous prime is 321220310029. The next prime is 321220310141. The reversal of 321220310113 is 311013022123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229769711649 + 91450598464 = 479343^2 + 302408^2 .

It is a cyclic number.

It is not a de Polignac number, because 321220310113 - 2³³ = 312630375521 is a prime.

It is not a weakly prime, because it can be changed into another prime (321220310513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610155056 + 160610155057.

It is an arithmetic number, because the mean of its divisors is an integer number (160610155057).

Almost surely, 2^321220310113 is an apocalyptic number.

It is an amenable number.

321220310113 is a deficient number, since it is larger than the sum of its proper divisors (1).

321220310113 is an equidigital number, since it uses as much as digits as its factorization.

321220310113 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 321220310113 its reverse (311013022123), we get a palindrome (632233332236).

The spelling of 321220310113 in words is "three hundred twenty-one billion, two hundred twenty million, three hundred ten thousand, one hundred thirteen".