243203505121 has 2 divisors, whose sum is σ = 243203505122. Its totient is φ = 243203505120.

The previous prime is 243203505109. The next prime is 243203505131. The reversal of 243203505121 is 121505302342.

243203505121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176874078096 + 66329427025 = 420564^2 + 257545^2 .

It is a cyclic number.

It is not a de Polignac number, because 243203505121 - 2²⁷ = 243069287393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243203505121.

It is not a weakly prime, because it can be changed into another prime (243203505131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121601752560 + 121601752561.

It is an arithmetic number, because the mean of its divisors is an integer number (121601752561).

Almost surely, 2^243203505121 is an apocalyptic number.

It is an amenable number.

243203505121 is a deficient number, since it is larger than the sum of its proper divisors (1).

243203505121 is an equidigital number, since it uses as much as digits as its factorization.

243203505121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 243203505121 its reverse (121505302342), we get a palindrome (364708807463).

The spelling of 243203505121 in words is "two hundred forty-three billion, two hundred three million, five hundred five thousand, one hundred twenty-one".