231303021 has 16 divisors (see below), whose sum is σ = 317193600. Its totient is φ = 149819328.

The previous prime is 231303013. The next prime is 231303049. The reversal of 231303021 is 120303132.

It is not a de Polignac number, because 231303021 - 2³ = 231303013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231303011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122160 + ... + 124038.

It is an arithmetic number, because the mean of its divisors is an integer number (19824600).

Almost surely, 2^231303021 is an apocalyptic number.

It is an amenable number.

231303021 is a deficient number, since it is larger than the sum of its proper divisors (85890579).

231303021 is a wasteful number, since it uses less digits than its factorization.

231303021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 231303021 is about 15208.6495455711. The cubic root of 231303021 is about 613.8474202385.

Adding to 231303021 its reverse (120303132), we get a palindrome (351606153).

The spelling of 231303021 in words is "two hundred thirty-one million, three hundred three thousand, twenty-one".