321243231 has 16 divisors (see below), whose sum is σ = 448268544. Its totient is φ = 204245184.

The previous prime is 321243227. The next prime is 321243233. The reversal of 321243231 is 132342123.

It is not a de Polignac number, because 321243231 - 2² = 321243227 is a prime.

It is a super-2 number, since 2×321243231² = 206394426926638722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321243198 and 321243207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321243233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17235 + ... + 30651.

It is an arithmetic number, because the mean of its divisors is an integer number (28016784).

Almost surely, 2^321243231 is an apocalyptic number.

321243231 is a deficient number, since it is larger than the sum of its proper divisors (127025313).

321243231 is a wasteful number, since it uses less digits than its factorization.

321243231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13790.

The product of its digits is 864, while the sum is 21.

The square root of 321243231 is about 17923.2594970893. The cubic root of 321243231 is about 684.8750236416.

Adding to 321243231 its reverse (132342123), we get a palindrome (453585354).

The spelling of 321243231 in words is "three hundred twenty-one million, two hundred forty-three thousand, two hundred thirty-one".