231324421 has 4 divisors (see below), whose sum is σ = 231356844. Its totient is φ = 231292000.

The previous prime is 231324397. The next prime is 231324433. The reversal of 231324421 is 124423132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 170015521 + 61308900 = 13039^2 + 7830^2 .

It is a cyclic number.

It is not a de Polignac number, because 231324421 - 2⁹ = 231323909 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231324392 and 231324401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231324451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310 + ... + 21511.

It is an arithmetic number, because the mean of its divisors is an integer number (57839211).

Almost surely, 2^231324421 is an apocalyptic number.

It is an amenable number.

231324421 is a deficient number, since it is larger than the sum of its proper divisors (32423).

231324421 is a wasteful number, since it uses less digits than its factorization.

231324421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32422.

The product of its digits is 1152, while the sum is 22.

The square root of 231324421 is about 15209.3530763146. The cubic root of 231324421 is about 613.8663505716.

Adding to 231324421 its reverse (124423132), we get a palindrome (355747553).

The spelling of 231324421 in words is "two hundred thirty-one million, three hundred twenty-four thousand, four hundred twenty-one".