12424421 has 4 divisors (see below), whose sum is σ = 12432000. Its totient is φ = 12416844.

The previous prime is 12424387. The next prime is 12424427. The reversal of 12424421 is 12442421.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12424421 is a prime.

It is a super-3 number, since 3×12424421³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12424393 and 12424402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12424427) 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, 191 + ... + 4988.

It is an arithmetic number, because the mean of its divisors is an integer number (3108000).

Almost surely, 2^12424421 is an apocalyptic number.

It is an amenable number.

12424421 is a deficient number, since it is larger than the sum of its proper divisors (7579).

12424421 is an equidigital number, since it uses as much as digits as its factorization.

12424421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7578.

The product of its digits is 512, while the sum is 20.

The square root of 12424421 is about 3524.8292157210. The cubic root of 12424421 is about 231.6107536049.

Adding to 12424421 its reverse (12442421), we get a palindrome (24866842).

The spelling of 12424421 in words is "twelve million, four hundred twenty-four thousand, four hundred twenty-one".