243204330321 has 6 divisors (see below), whose sum is σ = 351295143810. Its totient is φ = 162136220208.

The previous prime is 243204330311. The next prime is 243204330353. The reversal of 243204330321 is 123033402342.

243204330321 is a `hidden beast` number, since 2 + 4 + 3 + 2 + 0 + 4 + 330 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 243136761921 + 67568400 = 493089^2 + 8220^2 .

It is not a de Polignac number, because 243204330321 - 2²² = 243200136017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243204330301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13511351676 + ... + 13511351693.

It is an arithmetic number, because the mean of its divisors is an integer number (58549190635).

Almost surely, 2^243204330321 is an apocalyptic number.

It is an amenable number.

243204330321 is a deficient number, since it is larger than the sum of its proper divisors (108090813489).

243204330321 is a wasteful number, since it uses less digits than its factorization.

243204330321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27022703375 (or 27022703372 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 243204330321 its reverse (123033402342), we get a palindrome (366237732663).

The spelling of 243204330321 in words is "two hundred forty-three billion, two hundred four million, three hundred thirty thousand, three hundred twenty-one".