321231213 has 12 divisors (see below), whose sum is σ = 465039900. Its totient is φ = 213674496.

The previous prime is 321231191. The next prime is 321231221. The reversal of 321231213 is 312132123.

It can be written as a sum of positive squares in 2 ways, for example, as 246270249 + 74960964 = 15693^2 + 8658^2 .

It is not a de Polignac number, because 321231213 - 2⁵ = 321231181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321231413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35706 + ... + 43787.

It is an arithmetic number, because the mean of its divisors is an integer number (38753325).

Almost surely, 2^321231213 is an apocalyptic number.

It is an amenable number.

321231213 is a deficient number, since it is larger than the sum of its proper divisors (143808687).

321231213 is a wasteful number, since it uses less digits than its factorization.

321231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79948 (or 79945 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 321231213 is about 17922.9242312743. The cubic root of 321231213 is about 684.8664829370.

Adding to 321231213 its reverse (312132123), we get a palindrome (633363336).

The spelling of 321231213 in words is "three hundred twenty-one million, two hundred thirty-one thousand, two hundred thirteen".