231334021 has 8 divisors (see below), whose sum is σ = 235755000. Its totient is φ = 226933440.

The previous prime is 231334003. The next prime is 231334087. The reversal of 231334021 is 120433132.

It can be written as a sum of positive squares in 4 ways, for example, as 13771521 + 217562500 = 3711^2 + 14750^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231334021 - 2²¹ = 229236869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231334021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231334091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18855 + ... + 28603.

It is an arithmetic number, because the mean of its divisors is an integer number (29469375).

Almost surely, 2^231334021 is an apocalyptic number.

It is an amenable number.

231334021 is a deficient number, since it is larger than the sum of its proper divisors (4420979).

231334021 is an equidigital number, since it uses as much as digits as its factorization.

231334021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10199.

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

The square root of 231334021 is about 15209.6686683175. The cubic root of 231334021 is about 613.8748423043.

Adding to 231334021 its reverse (120433132), we get a palindrome (351767153).

The spelling of 231334021 in words is "two hundred thirty-one million, three hundred thirty-four thousand, twenty-one".