231221332 has 12 divisors (see below), whose sum is σ = 404846176. Its totient is φ = 115551000.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221332 is 233122132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5544 + ... + 22207.

Almost surely, 2^231221332 is an apocalyptic number.

It is an amenable number.

231221332 is a deficient number, since it is larger than the sum of its proper divisors (173624844).

231221332 is a wasteful number, since it uses less digits than its factorization.

231221332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29838 (or 29836 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 231221332 is about 15205.9636984967. The cubic root of 231221332 is about 613.7751478200.

Adding to 231221332 its reverse (233122132), we get a palindrome (464343464).

The spelling of 231221332 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-two".