321221013313 has 2 divisors, whose sum is σ = 321221013314. Its totient is φ = 321221013312.

The previous prime is 321221013293. The next prime is 321221013349. The reversal of 321221013313 is 313310122123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171244509489 + 149976503824 = 413817^2 + 387268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321221013313 is a prime.

It is not a weakly prime, because it can be changed into another prime (321221013613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610506656 + 160610506657.

It is an arithmetic number, because the mean of its divisors is an integer number (160610506657).

Almost surely, 2^321221013313 is an apocalyptic number.

It is an amenable number.

321221013313 is a deficient number, since it is larger than the sum of its proper divisors (1).

321221013313 is an equidigital number, since it uses as much as digits as its factorization.

321221013313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 321221013313 its reverse (313310122123), we get a palindrome (634531135436).

The spelling of 321221013313 in words is "three hundred twenty-one billion, two hundred twenty-one million, thirteen thousand, three hundred thirteen".