243120354721 has 2 divisors, whose sum is σ = 243120354722. Its totient is φ = 243120354720.

The previous prime is 243120354683. The next prime is 243120354727. The reversal of 243120354721 is 127453021342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188151207696 + 54969147025 = 433764^2 + 234455^2 .

It is a cyclic number.

It is not a de Polignac number, because 243120354721 - 2¹³ = 243120346529 is a prime.

It is not a weakly prime, because it can be changed into another prime (243120354727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560177360 + 121560177361.

It is an arithmetic number, because the mean of its divisors is an integer number (121560177361).

Almost surely, 2^243120354721 is an apocalyptic number.

It is an amenable number.

243120354721 is a deficient number, since it is larger than the sum of its proper divisors (1).

243120354721 is an equidigital number, since it uses as much as digits as its factorization.

243120354721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 243120354721 in words is "two hundred forty-three billion, one hundred twenty million, three hundred fifty-four thousand, seven hundred twenty-one".