243421240003 has 4 divisors (see below), whose sum is σ = 243448149400. Its totient is φ = 243394330608.

The previous prime is 243421239989. The next prime is 243421240031. The reversal of 243421240003 is 300042124342.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 243421240003 - 2²⁵ = 243387685571 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 243421240003.

It is not an unprimeable number, because it can be changed into a prime (243421240063) 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, 13441125 + ... + 13459222.

It is an arithmetic number, because the mean of its divisors is an integer number (60862037350).

Almost surely, 2^243421240003 is an apocalyptic number.

243421240003 is a deficient number, since it is larger than the sum of its proper divisors (26909397).

243421240003 is an equidigital number, since it uses as much as digits as its factorization.

243421240003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26909396.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 243421240003 its reverse (300042124342), we get a palindrome (543463364345).

The spelling of 243421240003 in words is "two hundred forty-three billion, four hundred twenty-one million, two hundred forty thousand, three".