321213231 has 12 divisors (see below), whose sum is σ = 472729608. Its totient is φ = 210101424.

The previous prime is 321213223. The next prime is 321213271. The reversal of 321213231 is 132312123.

321213231 is a `hidden beast` number, since 321 + 21 + 323 + 1 = 666.

It is not a de Polignac number, because 321213231 - 2³ = 321213223 is a prime.

It is a super-2 number, since 2×321213231² = 206355879538918722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321213271) 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, 336225 + ... + 337178.

It is an arithmetic number, because the mean of its divisors is an integer number (39394134).

Almost surely, 2^321213231 is an apocalyptic number.

321213231 is a deficient number, since it is larger than the sum of its proper divisors (151516377).

321213231 is a wasteful number, since it uses less digits than its factorization.

321213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673462 (or 673459 counting only the distinct ones).

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

The square root of 321213231 is about 17922.4225762033. The cubic root of 321213231 is about 684.8537034618.

Adding to 321213231 its reverse (132312123), we get a palindrome (453525354).

The spelling of 321213231 in words is "three hundred twenty-one million, two hundred thirteen thousand, two hundred thirty-one".