231221323 has 4 divisors (see below), whose sum is σ = 241274448. Its totient is φ = 221168200.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221323 is 323122132.

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 231221323 - 2¹³ = 231213131 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 231221323.

It is not an unprimeable number, because it can be changed into a prime (231221383) 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, 5026528 + ... + 5026573.

It is an arithmetic number, because the mean of its divisors is an integer number (60318612).

Almost surely, 2^231221323 is an apocalyptic number.

231221323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

231221323 is a deficient number, since it is larger than the sum of its proper divisors (10053125).

231221323 is a wasteful number, since it uses less digits than its factorization.

231221323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10053124.

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

The square root of 231221323 is about 15205.9634025602. The cubic root of 231221323 is about 613.7751398565.

Adding to 231221323 its reverse (323122132), we get a palindrome (554343455).

It can be divided in two parts, 23122132 and 3, that multiplied together give a palindrome (69366396).

The spelling of 231221323 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty-three".