12001421 has 2 divisors, whose sum is σ = 12001422. Its totient is φ = 12001420.

The previous prime is 12001411. The next prime is 12001427. The reversal of 12001421 is 12410021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11628100 + 373321 = 3410^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001421 - 2¹⁴ = 11985037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12001427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000710 + 6000711.

It is an arithmetic number, because the mean of its divisors is an integer number (6000711).

Almost surely, 2^12001421 is an apocalyptic number.

It is an amenable number.

12001421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001421 is an equidigital number, since it uses as much as digits as its factorization.

12001421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 12001421 is about 3464.3067127493. The cubic root of 12001421 is about 228.9518850370.

Adding to 12001421 its reverse (12410021), we get a palindrome (24411442).

The spelling of 12001421 in words is "twelve million, one thousand, four hundred twenty-one".