243120354321 has 32 divisors (see below), whose sum is σ = 373290761088. Its totient is φ = 139417574400.

The previous prime is 243120354227. The next prime is 243120354383. The reversal of 243120354321 is 123453021342.

It is not a de Polignac number, because 243120354321 - 2¹⁰ = 243120353297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243120354721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1748371 + ... + 1882296.

It is an arithmetic number, because the mean of its divisors is an integer number (11665336284).

Almost surely, 2^243120354321 is an apocalyptic number.

It is an amenable number.

243120354321 is a deficient number, since it is larger than the sum of its proper divisors (130170406767).

243120354321 is a wasteful number, since it uses less digits than its factorization.

243120354321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630801.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 243120354321 its reverse (123453021342), we get a palindrome (366573375663).

The spelling of 243120354321 in words is "two hundred forty-three billion, one hundred twenty million, three hundred fifty-four thousand, three hundred twenty-one".