323211221 has 2 divisors, whose sum is σ = 323211222. Its totient is φ = 323211220.

The previous prime is 323211209. The next prime is 323211281. The reversal of 323211221 is 122112323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308388721 + 14822500 = 17561^2 + 3850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-323211221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 323211221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (323211281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161605610 + 161605611.

It is an arithmetic number, because the mean of its divisors is an integer number (161605611).

Almost surely, 2^323211221 is an apocalyptic number.

It is an amenable number.

323211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

323211221 is an equidigital number, since it uses as much as digits as its factorization.

323211221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 323211221 is about 17978.0761206532. The cubic root of 323211221 is about 686.2707305481.

Adding to 323211221 its reverse (122112323), we get a palindrome (445323544).

The spelling of 323211221 in words is "three hundred twenty-three million, two hundred eleven thousand, two hundred twenty-one".