231024221 has 4 divisors (see below), whose sum is σ = 233406012. Its totient is φ = 228642432.

The previous prime is 231024193. The next prime is 231024229. The reversal of 231024221 is 122420132.

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 43744996 + 187279225 = 6614^2 + 13685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231024221 is a prime.

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 231024221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231024229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190750 + ... + 1190943.

It is an arithmetic number, because the mean of its divisors is an integer number (58351503).

Almost surely, 2^231024221 is an apocalyptic number.

It is an amenable number.

231024221 is a deficient number, since it is larger than the sum of its proper divisors (2381791).

231024221 is an equidigital number, since it uses as much as digits as its factorization.

231024221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381790.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 231024221 is about 15199.4809450849. The cubic root of 231024221 is about 613.6006883868.

Adding to 231024221 its reverse (122420132), we get a palindrome (353444353).

The spelling of 231024221 in words is "two hundred thirty-one million, twenty-four thousand, two hundred twenty-one".