321213213 has 12 divisors (see below), whose sum is σ = 470331420. Its totient is φ = 211208256.

The previous prime is 321213203. The next prime is 321213223. The reversal of 321213213 is 312312123.

321213213 is a `hidden beast` number, since 321 + 21 + 321 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (321213203) and next prime (321213223).

It can be written as a sum of positive squares in 2 ways, for example, as 180150084 + 141063129 = 13422^2 + 11877^2 .

It is not a de Polignac number, because 321213213 - 2⁶ = 321213149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321213203) 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, 243798 + ... + 245111.

It is an arithmetic number, because the mean of its divisors is an integer number (39194285).

Almost surely, 2^321213213 is an apocalyptic number.

It is an amenable number.

321213213 is a deficient number, since it is larger than the sum of its proper divisors (149118207).

321213213 is a wasteful number, since it uses less digits than its factorization.

321213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488988 (or 488985 counting only the distinct ones).

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

The square root of 321213213 is about 17922.4220740390. The cubic root of 321213213 is about 684.8536906693.

Adding to 321213213 its reverse (312312123), we get a palindrome (633525336).

The spelling of 321213213 in words is "three hundred twenty-one million, two hundred thirteen thousand, two hundred thirteen".