12421291 has 2 divisors, whose sum is σ = 12421292. Its totient is φ = 12421290.

The previous prime is 12421267. The next prime is 12421327. The reversal of 12421291 is 19212421.

It is a weak prime.

It is an emirp because it is prime and its reverse (19212421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12421291 - 2⁷ = 12421163 is a prime.

It is not a weakly prime, because it can be changed into another prime (12421261) 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 as a sum of consecutive naturals, namely, 6210645 + 6210646.

It is an arithmetic number, because the mean of its divisors is an integer number (6210646).

Almost surely, 2^12421291 is an apocalyptic number.

12421291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421291 is an equidigital number, since it uses as much as digits as its factorization.

12421291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 12421291 is about 3524.3851946120. The cubic root of 12421291 is about 231.5913025968.

The spelling of 12421291 in words is "twelve million, four hundred twenty-one thousand, two hundred ninety-one".