12730121 has 2 divisors, whose sum is σ = 12730122. Its totient is φ = 12730120.

The previous prime is 12730097. The next prime is 12730153. The reversal of 12730121 is 12103721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8042896 + 4687225 = 2836^2 + 2165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12730121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12730121.

It is not a weakly prime, because it can be changed into another prime (12730321) 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, 6365060 + 6365061.

It is an arithmetic number, because the mean of its divisors is an integer number (6365061).

Almost surely, 2^12730121 is an apocalyptic number.

It is an amenable number.

12730121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12730121 is an equidigital number, since it uses as much as digits as its factorization.

12730121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 12730121 is about 3567.9295116356. The cubic root of 12730121 is about 233.4949598999.

Adding to 12730121 its reverse (12103721), we get a palindrome (24833842).

The spelling of 12730121 in words is "twelve million, seven hundred thirty thousand, one hundred twenty-one".