323213221 has 2 divisors, whose sum is σ = 323213222. Its totient is φ = 323213220.

The previous prime is 323213203. The next prime is 323213251. The reversal of 323213221 is 122312323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301404321 + 21808900 = 17361^2 + 4670^2 .

It is a cyclic number.

It is not a de Polignac number, because 323213221 - 2¹¹ = 323211173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (323213251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161606610 + 161606611.

It is an arithmetic number, because the mean of its divisors is an integer number (161606611).

Almost surely, 2^323213221 is an apocalyptic number.

It is an amenable number.

323213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

323213221 is an equidigital number, since it uses as much as digits as its factorization.

323213221 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 323213221 is about 17978.1317438715. The cubic root of 323213221 is about 686.2721460709.

Adding to 323213221 its reverse (122312323), we get a palindrome (445525544).

It can be divided in two parts, 3232132 and 21, that added together give a triangular number (3232153 = T₂₅₄₂).

The spelling of 323213221 in words is "three hundred twenty-three million, two hundred thirteen thousand, two hundred twenty-one".