321331213 has 16 divisors (see below), whose sum is σ = 381394944. Its totient is φ = 264916080.

The previous prime is 321331201. The next prime is 321331271. The reversal of 321331213 is 312133123.

It is not a de Polignac number, because 321331213 - 2¹³ = 321323021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321331013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31806 + ... + 40672.

It is an arithmetic number, because the mean of its divisors is an integer number (23837184).

Almost surely, 2^321331213 is an apocalyptic number.

It is an amenable number.

321331213 is a deficient number, since it is larger than the sum of its proper divisors (60063731).

321331213 is a wasteful number, since it uses less digits than its factorization.

321331213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9072.

The product of its digits is 324, while the sum is 19.

The square root of 321331213 is about 17925.7137375336. The cubic root of 321331213 is about 684.9375423900.

Adding to 321331213 its reverse (312133123), we get a palindrome (633464336).

The spelling of 321331213 in words is "three hundred twenty-one million, three hundred thirty-one thousand, two hundred thirteen".