12443404421 has 32 divisors (see below), whose sum is σ = 14675040000. Its totient is φ = 10546151616.

The previous prime is 12443404387. The next prime is 12443404423. The reversal of 12443404421 is 12440434421.

12443404421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12443404421 - 2¹⁴ = 12443388037 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 (12443404423) 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 31 ways as a sum of consecutive naturals, for example, 14485490 + ... + 14486348.

It is an arithmetic number, because the mean of its divisors is an integer number (458595000).

Almost surely, 2^12443404421 is an apocalyptic number.

It is an amenable number.

12443404421 is a deficient number, since it is larger than the sum of its proper divisors (2231635579).

12443404421 is an equidigital number, since it uses as much as digits as its factorization.

12443404421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306 (or 1292 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 12443404421 its reverse (12440434421), we get a palindrome (24883838842).

The spelling of 12443404421 in words is "twelve billion, four hundred forty-three million, four hundred four thousand, four hundred twenty-one".