12442421 has 8 divisors (see below), whose sum is σ = 13036800. Its totient is φ = 11859120.

The previous prime is 12442411. The next prime is 12442427. The reversal of 12442421 is 12424421.

12442421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12442421 - 2²² = 8248117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12442393 and 12442402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12442427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425 + ... + 5006.

It is an arithmetic number, because the mean of its divisors is an integer number (1629600).

Almost surely, 2^12442421 is an apocalyptic number.

It is an amenable number.

12442421 is a deficient number, since it is larger than the sum of its proper divisors (594379).

12442421 is an equidigital number, since it uses as much as digits as its factorization.

12442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5539.

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

The square root of 12442421 is about 3527.3816068013. The cubic root of 12442421 is about 231.7225490733.

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

The spelling of 12442421 in words is "twelve million, four hundred forty-two thousand, four hundred twenty-one".