321397213 has 2 divisors, whose sum is σ = 321397214. Its totient is φ = 321397212.

The previous prime is 321397211. The next prime is 321397259. The reversal of 321397213 is 312793123.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257987844 + 63409369 = 16062^2 + 7963^2 .

It is a cyclic number.

It is not a de Polignac number, because 321397213 - 2¹ = 321397211 is a prime.

Together with 321397211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321397211) 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, 160698606 + 160698607.

It is an arithmetic number, because the mean of its divisors is an integer number (160698607).

Almost surely, 2^321397213 is an apocalyptic number.

It is an amenable number.

321397213 is a deficient number, since it is larger than the sum of its proper divisors (1).

321397213 is an equidigital number, since it uses as much as digits as its factorization.

321397213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 31.

The square root of 321397213 is about 17927.5545738955. The cubic root of 321397213 is about 684.9844335532.

The spelling of 321397213 in words is "three hundred twenty-one million, three hundred ninety-seven thousand, two hundred thirteen".