323021221 has 2 divisors, whose sum is σ = 323021222. Its totient is φ = 323021220.

The previous prime is 323021219. The next prime is 323021243. The reversal of 323021221 is 122120323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268468225 + 54552996 = 16385^2 + 7386^2 .

It is a cyclic number.

It is not a de Polignac number, because 323021221 - 2¹ = 323021219 is a prime.

Together with 323021219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 323021195 and 323021204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (323021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161510610 + 161510611.

It is an arithmetic number, because the mean of its divisors is an integer number (161510611).

Almost surely, 2^323021221 is an apocalyptic number.

It is an amenable number.

323021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

323021221 is an equidigital number, since it uses as much as digits as its factorization.

323021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 323021221 is about 17972.7911299275. The cubic root of 323021221 is about 686.1362292386.

Adding to 323021221 its reverse (122120323), we get a palindrome (445141544).

The spelling of 323021221 in words is "three hundred twenty-three million, twenty-one thousand, two hundred twenty-one".