231221234224 has 20 divisors (see below), whose sum is σ = 474343561944. Its totient is φ = 108809992448.

The previous prime is 231221234213. The next prime is 231221234227. The reversal of 231221234224 is 422432122132.

It is a junction number, because it is equal to n+sod(n) for n = 231221234192 and 231221234201.

It is not an unprimeable number, because it can be changed into a prime (231221234227) 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, 425038762 + ... + 425039305.

Almost surely, 2^231221234224 is an apocalyptic number.

It is an amenable number.

231221234224 is an abundant number, since it is smaller than the sum of its proper divisors (243122327720).

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

231221234224 is a wasteful number, since it uses less digits than its factorization.

231221234224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850078092 (or 850078086 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

Adding to 231221234224 its reverse (422432122132), we get a palindrome (653653356356).

The spelling of 231221234224 in words is "two hundred thirty-one billion, two hundred twenty-one million, two hundred thirty-four thousand, two hundred twenty-four".