243340230421 has 2 divisors, whose sum is σ = 243340230422. Its totient is φ = 243340230420.

The previous prime is 243340230407. The next prime is 243340230439. The reversal of 243340230421 is 124032043342.

243340230421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205402929796 + 37937300625 = 453214^2 + 194775^2 .

It is a cyclic number.

It is not a de Polignac number, because 243340230421 - 2⁵ = 243340230389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243340230421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243340230401) 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, 121670115210 + 121670115211.

It is an arithmetic number, because the mean of its divisors is an integer number (121670115211).

Almost surely, 2^243340230421 is an apocalyptic number.

It is an amenable number.

243340230421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243340230421 is an equidigital number, since it uses as much as digits as its factorization.

243340230421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 243340230421 its reverse (124032043342), we get a palindrome (367372273763).

The spelling of 243340230421 in words is "two hundred forty-three billion, three hundred forty million, two hundred thirty thousand, four hundred twenty-one".