12420052104421 has 4 divisors (see below), whose sum is σ = 13375440727852. Its totient is φ = 11464663480992.

The previous prime is 12420052104409. The next prime is 12420052104451. The reversal of 12420052104421 is 12440125002421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5574136843521 + 6845915260900 = 2360961^2 + 2616470^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420052104421 - 2⁷ = 12420052104293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12420052104421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420052104451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477694311696 + ... + 477694311721.

It is an arithmetic number, because the mean of its divisors is an integer number (3343860181963).

Almost surely, 2^{12420052104421} is an apocalyptic number.

It is an amenable number.

12420052104421 is a deficient number, since it is larger than the sum of its proper divisors (955388623431).

12420052104421 is an equidigital number, since it uses as much as digits as its factorization.

12420052104421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955388623430.

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 12420052104421 its reverse (12440125002421), we get a palindrome (24860177106842).

The spelling of 12420052104421 in words is "twelve trillion, four hundred twenty billion, fifty-two million, one hundred four thousand, four hundred twenty-one".