243530540321 has 4 divisors (see below), whose sum is σ = 256347937200. Its totient is φ = 230713143444.

The previous prime is 243530540299. The next prime is 243530540353. The reversal of 243530540321 is 123045035342.

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 243530540321 - 2³⁰ = 242456798497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243530540021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6408698411 + ... + 6408698448.

It is an arithmetic number, because the mean of its divisors is an integer number (64086984300).

Almost surely, 2^243530540321 is an apocalyptic number.

It is an amenable number.

243530540321 is a deficient number, since it is larger than the sum of its proper divisors (12817396879).

243530540321 is a wasteful number, since it uses less digits than its factorization.

243530540321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12817396878.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 243530540321 its reverse (123045035342), we get a palindrome (366575575663).

The spelling of 243530540321 in words is "two hundred forty-three billion, five hundred thirty million, five hundred forty thousand, three hundred twenty-one".