12133421 has 2 divisors, whose sum is σ = 12133422. Its totient is φ = 12133420.

The previous prime is 12133411. The next prime is 12133463. The reversal of 12133421 is 12433121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9853321 + 2280100 = 3139^2 + 1510^2 .

It is an emirp because it is prime and its reverse (12433121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12133421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12133421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12133411) 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, 6066710 + 6066711.

It is an arithmetic number, because the mean of its divisors is an integer number (6066711).

Almost surely, 2^12133421 is an apocalyptic number.

It is an amenable number.

12133421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12133421 is an equidigital number, since it uses as much as digits as its factorization.

12133421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 12133421 is about 3483.3060445502. The cubic root of 12133421 is about 229.7882171496.

Adding to 12133421 its reverse (12433121), we get a palindrome (24566542).

The spelling of 12133421 in words is "twelve million, one hundred thirty-three thousand, four hundred twenty-one".