232531221 has 16 divisors (see below), whose sum is σ = 334422144. Its totient is φ = 142868544.

The previous prime is 232531181. The next prime is 232531241. The reversal of 232531221 is 122135232.

232531221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 232531221 - 2¹¹ = 232529173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232531241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22000 + ... + 30806.

It is an arithmetic number, because the mean of its divisors is an integer number (20901384).

Almost surely, 2^232531221 is an apocalyptic number.

It is an amenable number.

232531221 is a deficient number, since it is larger than the sum of its proper divisors (101890923).

232531221 is a wasteful number, since it uses less digits than its factorization.

232531221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9500.

The product of its digits is 720, while the sum is 21.

The square root of 232531221 is about 15248.9744245310. The cubic root of 232531221 is about 614.9319959178.

Adding to 232531221 its reverse (122135232), we get a palindrome (354666453).

The spelling of 232531221 in words is "two hundred thirty-two million, five hundred thirty-one thousand, two hundred twenty-one".