12426421 has 4 divisors (see below), whose sum is σ = 14201632. Its totient is φ = 10651212.

The previous prime is 12426409. The next prime is 12426431. The reversal of 12426421 is 12462421.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 12426421 - 2⁵ = 12426389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12426392 and 12426401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12426431) 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, 887595 + ... + 887608.

It is an arithmetic number, because the mean of its divisors is an integer number (3550408).

Almost surely, 2^12426421 is an apocalyptic number.

It is an amenable number.

12426421 is a deficient number, since it is larger than the sum of its proper divisors (1775211).

12426421 is an equidigital number, since it uses as much as digits as its factorization.

12426421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775210.

The product of its digits is 768, while the sum is 22.

The square root of 12426421 is about 3525.1129059932. The cubic root of 12426421 is about 231.6231806536.

Adding to 12426421 its reverse (12462421), we get a palindrome (24888842).

The spelling of 12426421 in words is "twelve million, four hundred twenty-six thousand, four hundred twenty-one".