231124221 has 6 divisors (see below), whose sum is σ = 333846110. Its totient is φ = 154082808.

The previous prime is 231124219. The next prime is 231124249. The reversal of 231124221 is 122421132.

It is a happy number.

231124221 is a `hidden beast` number, since 231 + 12 + 422 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 230888025 + 236196 = 15195^2 + 486^2 .

It is not a de Polignac number, because 231124221 - 2¹ = 231124219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231124194 and 231124203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231124261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12840226 + ... + 12840243.

Almost surely, 2^231124221 is an apocalyptic number.

It is an amenable number.

231124221 is a deficient number, since it is larger than the sum of its proper divisors (102721889).

231124221 is a wasteful number, since it uses less digits than its factorization.

231124221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25680475 (or 25680472 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 231124221 is about 15202.7701752016. The cubic root of 231124221 is about 613.6892090007.

Adding to 231124221 its reverse (122421132), we get a palindrome (353545353).

The spelling of 231124221 in words is "two hundred thirty-one million, one hundred twenty-four thousand, two hundred twenty-one".