12432421 has 4 divisors (see below), whose sum is σ = 12643200. Its totient is φ = 12221644.

The previous prime is 12432391. The next prime is 12432449. The reversal of 12432421 is 12423421.

12432421 is digitally balanced in base 3, 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12423421 = 89 ⋅139589.

It is a cyclic number.

It is not a de Polignac number, because 12432421 - 2¹⁹ = 11908133 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 (12432221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105301 + ... + 105418.

It is an arithmetic number, because the mean of its divisors is an integer number (3160800).

Almost surely, 2^12432421 is an apocalyptic number.

It is an amenable number.

12432421 is a deficient number, since it is larger than the sum of its proper divisors (210779).

12432421 is an equidigital number, since it uses as much as digits as its factorization.

12432421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210778.

The product of its digits is 384, while the sum is 19.

The square root of 12432421 is about 3525.9638398600. The cubic root of 12432421 is about 231.6604538011.

Adding to 12432421 its reverse (12423421), we get a palindrome (24855842).

It can be divided in two parts, 124 and 32421, that multiplied together give a palindrome (4020204).

The spelling of 12432421 in words is "twelve million, four hundred thirty-two thousand, four hundred twenty-one".