231123221 has 8 divisors (see below), whose sum is σ = 265327104. Its totient is φ = 197215920.

The previous prime is 231123209. The next prime is 231123227. The reversal of 231123221 is 122321132.

231123221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231123221 is a prime.

It is a super-3 number, since 3×231123221³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231123221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231123227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72470 + ... + 75591.

It is an arithmetic number, because the mean of its divisors is an integer number (33165888).

Almost surely, 2^231123221 is an apocalyptic number.

It is an amenable number.

231123221 is a deficient number, since it is larger than the sum of its proper divisors (34203883).

231123221 is a wasteful number, since it uses less digits than its factorization.

231123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148291.

The product of its digits is 144, while the sum is 17.

The square root of 231123221 is about 15202.7372864231. The cubic root of 231123221 is about 613.6883239210.

Adding to 231123221 its reverse (122321132), we get a palindrome (353444353).

The spelling of 231123221 in words is "two hundred thirty-one million, one hundred twenty-three thousand, two hundred twenty-one".