243113504021 has 4 divisors (see below), whose sum is σ = 243115041600. Its totient is φ = 243111966444.

The previous prime is 243113504003. The next prime is 243113504047. The reversal of 243113504021 is 120405311342.

It is a happy number.

243113504021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243113504021 - 2²⁶ = 243046395157 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 (243113501021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500381 + ... + 858258.

It is an arithmetic number, because the mean of its divisors is an integer number (60778760400).

Almost surely, 2^243113504021 is an apocalyptic number.

It is an amenable number.

243113504021 is a deficient number, since it is larger than the sum of its proper divisors (1537579).

243113504021 is a wasteful number, since it uses less digits than its factorization.

243113504021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537578.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 243113504021 its reverse (120405311342), we get a palindrome (363518815363).

The spelling of 243113504021 in words is "two hundred forty-three billion, one hundred thirteen million, five hundred four thousand, twenty-one".