243421023 has 4 divisors (see below), whose sum is σ = 324561368. Its totient is φ = 162280680.

The previous prime is 243421007. The next prime is 243421043. The reversal of 243421023 is 320124342.

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

It is not a de Polignac number, because 243421023 - 2⁴ = 243421007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243421043) 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, 40570168 + ... + 40570173.

It is an arithmetic number, because the mean of its divisors is an integer number (81140342).

Almost surely, 2^243421023 is an apocalyptic number.

243421023 is a deficient number, since it is larger than the sum of its proper divisors (81140345).

243421023 is an equidigital number, since it uses as much as digits as its factorization.

243421023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81140344.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 243421023 is about 15601.9557427907. The cubic root of 243421023 is about 624.3853353246.

Adding to 243421023 its reverse (320124342), we get a palindrome (563545365).

The spelling of 243421023 in words is "two hundred forty-three million, four hundred twenty-one thousand, twenty-three".