231112221 has 8 divisors (see below), whose sum is σ = 308405280. Its totient is φ = 153946992.

The previous prime is 231112213. The next prime is 231112237. The reversal of 231112221 is 122211132.

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

It is not a de Polignac number, because 231112221 - 2³ = 231112213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231110221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27655 + ... + 35028.

It is an arithmetic number, because the mean of its divisors is an integer number (38550660).

Almost surely, 2^231112221 is an apocalyptic number.

It is an amenable number.

231112221 is a deficient number, since it is larger than the sum of its proper divisors (77293059).

231112221 is a wasteful number, since it uses less digits than its factorization.

231112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63915.

The product of its digits is 48, while the sum is 15.

The square root of 231112221 is about 15202.3755051637. The cubic root of 231112221 is about 613.6785878754.

Adding to 231112221 its reverse (122211132), we get a palindrome (353323353).

The spelling of 231112221 in words is "two hundred thirty-one million, one hundred twelve thousand, two hundred twenty-one".