323213521 has 2 divisors, whose sum is σ = 323213522. Its totient is φ = 323213520.

The previous prime is 323213519. The next prime is 323213531. The reversal of 323213521 is 125312323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 323100625 + 112896 = 17975^2 + 336^2 .

It is a cyclic number.

It is not a de Polignac number, because 323213521 - 2¹ = 323213519 is a prime.

Together with 323213519, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 323213492 and 323213501.

It is not a weakly prime, because it can be changed into another prime (323213531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161606760 + 161606761.

It is an arithmetic number, because the mean of its divisors is an integer number (161606761).

Almost surely, 2^323213521 is an apocalyptic number.

It is an amenable number.

323213521 is a deficient number, since it is larger than the sum of its proper divisors (1).

323213521 is an equidigital number, since it uses as much as digits as its factorization.

323213521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 22.

The square root of 323213521 is about 17978.1400873394. The cubic root of 323213521 is about 686.2723583989.

Adding to 323213521 its reverse (125312323), we get a palindrome (448525844).

The spelling of 323213521 in words is "three hundred twenty-three million, two hundred thirteen thousand, five hundred twenty-one".