12421443 has 4 divisors (see below), whose sum is σ = 16561928. Its totient is φ = 8280960.

The previous prime is 12421439. The next prime is 12421481. The reversal of 12421443 is 34412421.

12421443 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34412421 = 3 ⋅11470807.

It is not a de Polignac number, because 12421443 - 2² = 12421439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2070238 + ... + 2070243.

It is an arithmetic number, because the mean of its divisors is an integer number (4140482).

Almost surely, 2^12421443 is an apocalyptic number.

12421443 is a deficient number, since it is larger than the sum of its proper divisors (4140485).

12421443 is an equidigital number, since it uses as much as digits as its factorization.

12421443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140484.

The product of its digits is 768, while the sum is 21.

The square root of 12421443 is about 3524.4067585907. The cubic root of 12421443 is about 231.5922472579.

Adding to 12421443 its reverse (34412421), we get a palindrome (46833864).

The spelling of 12421443 in words is "twelve million, four hundred twenty-one thousand, four hundred forty-three".