321320213 has 8 divisors (see below), whose sum is σ = 340391232. Its totient is φ = 302268096.

The previous prime is 321320183. The next prime is 321320221. The reversal of 321320213 is 312023123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321320213 - 2⁶ = 321320149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321320191 and 321320200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321320113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45806 + ... + 52352.

It is an arithmetic number, because the mean of its divisors is an integer number (42548904).

Almost surely, 2^321320213 is an apocalyptic number.

It is an amenable number.

321320213 is a deficient number, since it is larger than the sum of its proper divisors (19071019).

321320213 is a wasteful number, since it uses less digits than its factorization.

321320213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9451.

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

The square root of 321320213 is about 17925.4069130941. The cubic root of 321320213 is about 684.9297265718.

Adding to 321320213 its reverse (312023123), we get a palindrome (633343336).

The spelling of 321320213 in words is "three hundred twenty-one million, three hundred twenty thousand, two hundred thirteen".