12421421 has 8 divisors (see below), whose sum is σ = 13497600. Its totient is φ = 11387520.

The previous prime is 12421417. The next prime is 12421427. The reversal of 12421421 is 12412421.

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 12421421 - 2² = 12421417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12421421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421427) 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 7 ways as a sum of consecutive naturals, for example, 9956 + ... + 11133.

It is an arithmetic number, because the mean of its divisors is an integer number (1687200).

Almost surely, 2^12421421 is an apocalyptic number.

It is an amenable number.

12421421 is a deficient number, since it is larger than the sum of its proper divisors (1076179).

12421421 is a wasteful number, since it uses less digits than its factorization.

12421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21139.

The product of its digits is 128, while the sum is 17.

The square root of 12421421 is about 3524.4036374967. The cubic root of 12421421 is about 231.5921105311.

Adding to 12421421 its reverse (12412421), we get a palindrome (24833842).

The spelling of 12421421 in words is "twelve million, four hundred twenty-one thousand, four hundred twenty-one".