231321223 has 4 divisors (see below), whose sum is σ = 264367120. Its totient is φ = 198275328.

The previous prime is 231321191. The next prime is 231321301. The reversal of 231321223 is 322123132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231321223 - 2⁵ = 231321191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231321223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321823) 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, 16522938 + ... + 16522951.

It is an arithmetic number, because the mean of its divisors is an integer number (66091780).

Almost surely, 2^231321223 is an apocalyptic number.

231321223 is a deficient number, since it is larger than the sum of its proper divisors (33045897).

231321223 is an equidigital number, since it uses as much as digits as its factorization.

231321223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33045896.

The product of its digits is 432, while the sum is 19.

The square root of 231321223 is about 15209.2479432745. The cubic root of 231321223 is about 613.8635217110.

Adding to 231321223 its reverse (322123132), we get a palindrome (553444355).

The spelling of 231321223 in words is "two hundred thirty-one million, three hundred twenty-one thousand, two hundred twenty-three".