242343400021 has 2 divisors, whose sum is σ = 242343400022. Its totient is φ = 242343400020.

The previous prime is 242343400009. The next prime is 242343400073. The reversal of 242343400021 is 120004343242.

It is a happy number.

242343400021 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., 128440524996 + 113902875025 = 358386^2 + 337495^2 .

It is a cyclic number.

It is not a de Polignac number, because 242343400021 - 2¹¹ = 242343397973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242343400121) 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, 121171700010 + 121171700011.

It is an arithmetic number, because the mean of its divisors is an integer number (121171700011).

Almost surely, 2^242343400021 is an apocalyptic number.

It is an amenable number.

242343400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

242343400021 is an equidigital number, since it uses as much as digits as its factorization.

242343400021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 242343400021 its reverse (120004343242), we get a palindrome (362347743263).

The spelling of 242343400021 in words is "two hundred forty-two billion, three hundred forty-three million, four hundred thousand, twenty-one".