12528121 has 2 divisors, whose sum is σ = 12528122. Its totient is φ = 12528120.

The previous prime is 12528107. The next prime is 12528143. The reversal of 12528121 is 12182521.

It is an a-pointer prime, because the next prime (12528143) can be obtained adding 12528121 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12524521 + 3600 = 3539^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 12528121 - 2⁹ = 12527609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12528092 and 12528101.

It is not a weakly prime, because it can be changed into another prime (12528101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6264060 + 6264061.

It is an arithmetic number, because the mean of its divisors is an integer number (6264061).

Almost surely, 2^12528121 is an apocalyptic number.

It is an amenable number.

12528121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12528121 is an equidigital number, since it uses as much as digits as its factorization.

12528121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 22.

The square root of 12528121 is about 3539.5085817102. The cubic root of 12528121 is about 232.2533461621.

The spelling of 12528121 in words is "twelve million, five hundred twenty-eight thousand, one hundred twenty-one".