321320331313 has 2 divisors, whose sum is σ = 321320331314. Its totient is φ = 321320331312.

The previous prime is 321320331263. The next prime is 321320331317. The reversal of 321320331313 is 313133023123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308282573824 + 13037757489 = 555232^2 + 114183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321320331313 is a prime.

It is not a weakly prime, because it can be changed into another prime (321320331317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160660165656 + 160660165657.

It is an arithmetic number, because the mean of its divisors is an integer number (160660165657).

Almost surely, 2^321320331313 is an apocalyptic number.

It is an amenable number.

321320331313 is a deficient number, since it is larger than the sum of its proper divisors (1).

321320331313 is an equidigital number, since it uses as much as digits as its factorization.

321320331313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 25.

Adding to 321320331313 its reverse (313133023123), we get a palindrome (634453354436).

The spelling of 321320331313 in words is "three hundred twenty-one billion, three hundred twenty million, three hundred thirty-one thousand, three hundred thirteen".