232231221 has 12 divisors (see below), whose sum is σ = 337386348. Its totient is φ = 153924864.

The previous prime is 232231211. The next prime is 232231229. The reversal of 232231221 is 122132232.

It can be written as a sum of positive squares in 2 ways, for example, as 112656996 + 119574225 = 10614^2 + 10935^2 .

It is not a de Polignac number, because 232231221 - 2⁵ = 232231189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 232231194 and 232231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232231229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73020 + ... + 76133.

It is an arithmetic number, because the mean of its divisors is an integer number (28115529).

Almost surely, 2^232231221 is an apocalyptic number.

It is an amenable number.

232231221 is a deficient number, since it is larger than the sum of its proper divisors (105155127).

232231221 is a wasteful number, since it uses less digits than its factorization.

232231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149332 (or 149329 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 232231221 is about 15239.1345226689. The cubic root of 232231221 is about 614.6674307405.

Adding to 232231221 its reverse (122132232), we get a palindrome (354363453).

The spelling of 232231221 in words is "two hundred thirty-two million, two hundred thirty-one thousand, two hundred twenty-one".