12440113421 has 4 divisors (see below), whose sum is σ = 12456461244. Its totient is φ = 12423765600.

The previous prime is 12440113403. The next prime is 12440113451. The reversal of 12440113421 is 12431104421.

12440113421 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 can be written as a sum of positive squares in 2 ways, for example, as 130210921 + 12309902500 = 11411^2 + 110950^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440113421 - 2²² = 12435919117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440113451) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 8172770 + ... + 8174291.

It is an arithmetic number, because the mean of its divisors is an integer number (3114115311).

Almost surely, 2^12440113421 is an apocalyptic number.

It is an amenable number.

12440113421 is a deficient number, since it is larger than the sum of its proper divisors (16347823).

12440113421 is an equidigital number, since it uses as much as digits as its factorization.

12440113421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16347822.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 12440113421 its reverse (12431104421), we get a palindrome (24871217842).

The spelling of 12440113421 in words is "twelve billion, four hundred forty million, one hundred thirteen thousand, four hundred twenty-one".