323221321 has 2 divisors, whose sum is σ = 323221322. Its totient is φ = 323221320.

The previous prime is 323221309. The next prime is 323221343. The reversal of 323221321 is 123122323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178356025 + 144865296 = 13355^2 + 12036^2 .

It is an emirp because it is prime and its reverse (123122323) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 323221321 - 2²⁷ = 189003593 is a prime.

It is not a weakly prime, because it can be changed into another prime (323221361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161610660 + 161610661.

It is an arithmetic number, because the mean of its divisors is an integer number (161610661).

Almost surely, 2^323221321 is an apocalyptic number.

It is an amenable number.

323221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

323221321 is an equidigital number, since it uses as much as digits as its factorization.

323221321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 323221321 is about 17978.3570161458. The cubic root of 323221321 is about 686.2778788789.

Adding to 323221321 its reverse (123122323), we get a palindrome (446343644).

The spelling of 323221321 in words is "three hundred twenty-three million, two hundred twenty-one thousand, three hundred twenty-one".