243032203121 has 4 divisors (see below), whose sum is σ = 253598820672. Its totient is φ = 232465585572.

The previous prime is 243032203087. The next prime is 243032203129. The reversal of 243032203121 is 121302230342.

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 243032203121 - 2²⁶ = 242965094257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 10566617527 = 243032203121 / (2 + 4 + 3 + 0 + 3 + 2 + 2 + 0 + 3 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243032203129) 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, 5283308741 + ... + 5283308786.

It is an arithmetic number, because the mean of its divisors is an integer number (63399705168).

Almost surely, 2^243032203121 is an apocalyptic number.

It is an amenable number.

243032203121 is a deficient number, since it is larger than the sum of its proper divisors (10566617551).

243032203121 is a wasteful number, since it uses less digits than its factorization.

243032203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10566617550.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 243032203121 its reverse (121302230342), we get a palindrome (364334433463).

The spelling of 243032203121 in words is "two hundred forty-three billion, thirty-two million, two hundred three thousand, one hundred twenty-one".