12429121 has 2 divisors, whose sum is σ = 12429122. Its totient is φ = 12429120.

The previous prime is 12429073. The next prime is 12429127. The reversal of 12429121 is 12192421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7230721 + 5198400 = 2689^2 + 2280^2 .

It is an emirp because it is prime and its reverse (12192421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12429121 - 2⁹ = 12428609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12429092 and 12429101.

It is not a weakly prime, because it can be changed into another prime (12429127) 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, 6214560 + 6214561.

It is an arithmetic number, because the mean of its divisors is an integer number (6214561).

Almost surely, 2^12429121 is an apocalyptic number.

It is an amenable number.

12429121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12429121 is an equidigital number, since it uses as much as digits as its factorization.

12429121 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 12429121 is about 3525.4958516498. The cubic root of 12429121 is about 231.6399550544.

The spelling of 12429121 in words is "twelve million, four hundred twenty-nine thousand, one hundred twenty-one".