321222213 has 32 divisors (see below), whose sum is σ = 513564800. Its totient is φ = 197261568.

The previous prime is 321222199. The next prime is 321222269. The reversal of 321222213 is 312222123.

It is not a de Polignac number, because 321222213 - 2⁹ = 321221701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321222313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 317853 + ... + 318861.

It is an arithmetic number, because the mean of its divisors is an integer number (16048900).

Almost surely, 2^321222213 is an apocalyptic number.

It is an amenable number.

321222213 is a deficient number, since it is larger than the sum of its proper divisors (192342587).

321222213 is a wasteful number, since it uses less digits than its factorization.

321222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938 (or 1932 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 321222213 is about 17922.6731544153. The cubic root of 321222213 is about 684.8600868629.

Adding to 321222213 its reverse (312222123), we get a palindrome (633444336).

It can be divided in two parts, 3212 and 22213, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 321222213 in words is "three hundred twenty-one million, two hundred twenty-two thousand, two hundred thirteen".