12508121 has 4 divisors (see below), whose sum is σ = 12571812. Its totient is φ = 12444432.

The previous prime is 12508117. The next prime is 12508123. The reversal of 12508121 is 12180521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12180521 = 277 ⋅43973.

It can be written as a sum of positive squares in 2 ways, for example, as 6451600 + 6056521 = 2540^2 + 2461^2 .

It is a cyclic number.

It is not a de Polignac number, because 12508121 - 2² = 12508117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12508093 and 12508102.

It is not an unprimeable number, because it can be changed into a prime (12508123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31550 + ... + 31943.

It is an arithmetic number, because the mean of its divisors is an integer number (3142953).

Almost surely, 2^12508121 is an apocalyptic number.

It is an amenable number.

12508121 is a deficient number, since it is larger than the sum of its proper divisors (63691).

12508121 is an equidigital number, since it uses as much as digits as its factorization.

12508121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63690.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 12508121 is about 3536.6822022907. The cubic root of 12508121 is about 232.1296899243.

Adding to 12508121 its reverse (12180521), we get a palindrome (24688642).

The spelling of 12508121 in words is "twelve million, five hundred eight thousand, one hundred twenty-one".