12421879 has 4 divisors (see below), whose sum is σ = 12429376. Its totient is φ = 12414384.

The previous prime is 12421873. The next prime is 12421891. The reversal of 12421879 is 97812421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97812421 = 7 ⋅13973203.

It is a cyclic number.

It is not a de Polignac number, because 12421879 - 2¹¹ = 12419831 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 (12421873) 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, 39 + ... + 4984.

It is an arithmetic number, because the mean of its divisors is an integer number (3107344).

Almost surely, 2^12421879 is an apocalyptic number.

12421879 is a deficient number, since it is larger than the sum of its proper divisors (7497).

12421879 is an equidigital number, since it uses as much as digits as its factorization.

12421879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7496.

The product of its digits is 8064, while the sum is 34.

The square root of 12421879 is about 3524.4686124294. The cubic root of 12421879 is about 231.5949569012.

The spelling of 12421879 in words is "twelve million, four hundred twenty-one thousand, eight hundred seventy-nine".