12420043238 has 4 divisors (see below), whose sum is σ = 18630064860. Its totient is φ = 6210021618.

The previous prime is 12420043201. The next prime is 12420043241. The reversal of 12420043238 is 83234002421.

12420043238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12420043238.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3105010808 + ... + 3105010811.

It is an arithmetic number, because the mean of its divisors is an integer number (4657516215).

Almost surely, 2^12420043238 is an apocalyptic number.

12420043238 is a deficient number, since it is larger than the sum of its proper divisors (6210021622).

12420043238 is an equidigital number, since it uses as much as digits as its factorization.

12420043238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6210021621.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 12420043238 its reverse (83234002421), we get a palindrome (95654045659).

The spelling of 12420043238 in words is "twelve billion, four hundred twenty million, forty-three thousand, two hundred thirty-eight".