243242504321 has 4 divisors (see below), whose sum is σ = 244875004500. Its totient is φ = 241610004144.

The previous prime is 243242504317. The next prime is 243242504359. The reversal of 243242504321 is 123405242342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51104932096 + 192137572225 = 226064^2 + 438335^2 .

It is a cyclic number.

It is not a de Polignac number, because 243242504321 - 2² = 243242504317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243242504371) 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, 816249866 + ... + 816250163.

It is an arithmetic number, because the mean of its divisors is an integer number (61218751125).

Almost surely, 2^243242504321 is an apocalyptic number.

It is an amenable number.

243242504321 is a deficient number, since it is larger than the sum of its proper divisors (1632500179).

243242504321 is a wasteful number, since it uses less digits than its factorization.

243242504321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632500178.

The product of its (nonzero) digits is 46080, while the sum is 32.

Adding to 243242504321 its reverse (123405242342), we get a palindrome (366647746663).

The spelling of 243242504321 in words is "two hundred forty-three billion, two hundred forty-two million, five hundred four thousand, three hundred twenty-one".