321223213 has 4 divisors (see below), whose sum is σ = 322837600. Its totient is φ = 319608828.

The previous prime is 321223193. The next prime is 321223223. The reversal of 321223213 is 312322123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312322123 = 10993 ⋅28411.

It is a cyclic number.

It is not a de Polignac number, because 321223213 - 2⁵ = 321223181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321223223) 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, 806895 + ... + 807292.

It is an arithmetic number, because the mean of its divisors is an integer number (80709400).

Almost surely, 2^321223213 is an apocalyptic number.

It is an amenable number.

321223213 is a deficient number, since it is larger than the sum of its proper divisors (1614387).

321223213 is a wasteful number, since it uses less digits than its factorization.

321223213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614386.

The product of its digits is 432, while the sum is 19.

The square root of 321223213 is about 17922.7010520178. The cubic root of 321223213 is about 684.8607975437.

Adding to 321223213 its reverse (312322123), we get a palindrome (633545336).

The spelling of 321223213 in words is "three hundred twenty-one million, two hundred twenty-three thousand, two hundred thirteen".