320321213 has 4 divisors (see below), whose sum is σ = 323156028. Its totient is φ = 317486400.

The previous prime is 320321203. The next prime is 320321227. The reversal of 320321213 is 312123023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118766404 + 201554809 = 10898^2 + 14197^2 .

It is a cyclic number.

It is not a de Polignac number, because 320321213 - 2⁶ = 320321149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320321191 and 320321200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320321203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417238 + ... + 1417463.

It is an arithmetic number, because the mean of its divisors is an integer number (80789007).

Almost surely, 2^320321213 is an apocalyptic number.

It is an amenable number.

320321213 is a deficient number, since it is larger than the sum of its proper divisors (2834815).

320321213 is a wasteful number, since it uses less digits than its factorization.

320321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834814.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 320321213 is about 17897.5197443668. The cubic root of 320321213 is about 684.2191631804.

Adding to 320321213 its reverse (312123023), we get a palindrome (632444236).

The spelling of 320321213 in words is "three hundred twenty million, three hundred twenty-one thousand, two hundred thirteen".