12012421 has 4 divisors (see below), whose sum is σ = 12719052. Its totient is φ = 11305792.

The previous prime is 12012367. The next prime is 12012433. The reversal of 12012421 is 12421021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6180196 + 5832225 = 2486^2 + 2415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12012421 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 (12012461) 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 3 ways as a sum of consecutive naturals, for example, 353290 + ... + 353323.

It is an arithmetic number, because the mean of its divisors is an integer number (3179763).

Almost surely, 2^12012421 is an apocalyptic number.

It is an amenable number.

12012421 is a deficient number, since it is larger than the sum of its proper divisors (706631).

12012421 is an equidigital number, since it uses as much as digits as its factorization.

12012421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706630.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 12012421 is about 3465.8939683724. The cubic root of 12012421 is about 229.0218129143.

Adding to 12012421 its reverse (12421021), we get a palindrome (24433442).

The spelling of 12012421 in words is "twelve million, twelve thousand, four hundred twenty-one".