243120717221 has 2 divisors, whose sum is σ = 243120717222. Its totient is φ = 243120717220.

The previous prime is 243120717209. The next prime is 243120717233. The reversal of 243120717221 is 122717021342.

It is a balanced prime because it is at equal distance from previous prime (243120717209) and next prime (243120717233).

It can be written as a sum of positive squares in only one way, i.e., 240211732996 + 2908984225 = 490114^2 + 53935^2 .

It is a cyclic number.

It is not a de Polignac number, because 243120717221 - 2²² = 243116522917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243120717251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560358610 + 121560358611.

It is an arithmetic number, because the mean of its divisors is an integer number (121560358611).

Almost surely, 2^243120717221 is an apocalyptic number.

It is an amenable number.

243120717221 is a deficient number, since it is larger than the sum of its proper divisors (1).

243120717221 is an equidigital number, since it uses as much as digits as its factorization.

243120717221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

Adding to 243120717221 its reverse (122717021342), we get a palindrome (365837738563).

The spelling of 243120717221 in words is "two hundred forty-three billion, one hundred twenty million, seven hundred seventeen thousand, two hundred twenty-one".