4240243243421 has 2 divisors, whose sum is σ = 4240243243422. Its totient is φ = 4240243243420.

The previous prime is 4240243243409. The next prime is 4240243243427. The reversal of 4240243243421 is 1243423420424.

4240243243421 is digitally balanced in base 3, 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., 3679257223321 + 560986020100 = 1918139^2 + 748990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4240243243421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4240243243427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2120121621710 + 2120121621711.

It is an arithmetic number, because the mean of its divisors is an integer number (2120121621711).

Almost surely, 2^{4240243243421} is an apocalyptic number.

It is an amenable number.

4240243243421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4240243243421 is an equidigital number, since it uses as much as digits as its factorization.

4240243243421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 35.

Adding to 4240243243421 its reverse (1243423420424), we get a palindrome (5483666663845).

The spelling of 4240243243421 in words is "four trillion, two hundred forty billion, two hundred forty-three million, two hundred forty-three thousand, four hundred twenty-one".