231221112 has 32 divisors (see below), whose sum is σ = 578428800. Its totient is φ = 77023584.

The previous prime is 231221083. The next prime is 231221113. The reversal of 231221112 is 211122132.

231221112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 231221091 and 231221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221113) 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, 63189 + ... + 66747.

It is an arithmetic number, because the mean of its divisors is an integer number (18075900).

Almost surely, 2^231221112 is an apocalyptic number.

It is an amenable number.

231221112 is an abundant number, since it is smaller than the sum of its proper divisors (347207688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231221112 is a wasteful number, since it uses less digits than its factorization.

231221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275 (or 6271 counting only the distinct ones).

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

The square root of 231221112 is about 15205.9564644911. The cubic root of 231221112 is about 613.7749531572.

Adding to 231221112 its reverse (211122132), we get a palindrome (442343244).

The spelling of 231221112 in words is "two hundred thirty-one million, two hundred twenty-one thousand, one hundred twelve".