243233174772221 has 2 divisors, whose sum is σ = 243233174772222. Its totient is φ = 243233174772220.

The previous prime is 243233174772199. The next prime is 243233174772283. The reversal of 243233174772221 is 122277471332342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123304612356121 + 119928562416100 = 11104261^2 + 10951190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243233174772221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243233174772221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243233174772121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121616587386110 + 121616587386111.

It is an arithmetic number, because the mean of its divisors is an integer number (121616587386111).

Almost surely, 2^{243233174772221} is an apocalyptic number.

It is an amenable number.

243233174772221 is a deficient number, since it is larger than the sum of its proper divisors (1).

243233174772221 is an equidigital number, since it uses as much as digits as its factorization.

243233174772221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4741632, while the sum is 50.

The spelling of 243233174772221 in words is "two hundred forty-three trillion, two hundred thirty-three billion, one hundred seventy-four million, seven hundred seventy-two thousand, two hundred twenty-one".