42040243243 has 2 divisors, whose sum is σ = 42040243244. Its totient is φ = 42040243242.

The previous prime is 42040243237. The next prime is 42040243307. The reversal of 42040243243 is 34234204024.

It is a happy number.

42040243243 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 is a cyclic number.

It is not a de Polignac number, because 42040243243 - 2²⁵ = 42006688811 is a prime.

It is not a weakly prime, because it can be changed into another prime (42040246243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21020121621 + 21020121622.

It is an arithmetic number, because the mean of its divisors is an integer number (21020121622).

Almost surely, 2^42040243243 is an apocalyptic number.

42040243243 is a deficient number, since it is larger than the sum of its proper divisors (1).

42040243243 is an equidigital number, since it uses as much as digits as its factorization.

42040243243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 42040243243 its reverse (34234204024), we get a palindrome (76274447267).

The spelling of 42040243243 in words is "forty-two billion, forty million, two hundred forty-three thousand, two hundred forty-three".