243118745321 has 2 divisors, whose sum is σ = 243118745322. Its totient is φ = 243118745320.

The previous prime is 243118745293. The next prime is 243118745357. The reversal of 243118745321 is 123547811342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129456040000 + 113662705321 = 359800^2 + 337139^2 .

It is a cyclic number.

It is not a de Polignac number, because 243118745321 - 2⁶ = 243118745257 is a prime.

It is not a weakly prime, because it can be changed into another prime (243118745021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121559372660 + 121559372661.

It is an arithmetic number, because the mean of its divisors is an integer number (121559372661).

Almost surely, 2^243118745321 is an apocalyptic number.

It is an amenable number.

243118745321 is a deficient number, since it is larger than the sum of its proper divisors (1).

243118745321 is an equidigital number, since it uses as much as digits as its factorization.

243118745321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The spelling of 243118745321 in words is "two hundred forty-three billion, one hundred eighteen million, seven hundred forty-five thousand, three hundred twenty-one".