230921 has 4 divisors (see below), whose sum is σ = 235332. Its totient is φ = 226512.

The previous prime is 230891. The next prime is 230929. The reversal of 230921 is 129032.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211600 + 19321 = 460^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 230921 - 2¹⁰ = 229897 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 230921.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 230921.

It is not an unprimeable number, because it can be changed into a prime (230929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2126 + ... + 2231.

It is an arithmetic number, because the mean of its divisors is an integer number (58833).

2²³⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

230921 is a deficient number, since it is larger than the sum of its proper divisors (4411).

230921 is an equidigital number, since it uses as much as digits as its factorization.

230921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 230921 is about 480.5424018752. The cubic root of 230921 is about 61.3509289728.

Adding to 230921 its reverse (129032), we get a palindrome (359953).

The spelling of 230921 in words is "two hundred thirty thousand, nine hundred twenty-one".