12445121 has 4 divisors (see below), whose sum is σ = 13402452. Its totient is φ = 11487792.

The previous prime is 12445117. The next prime is 12445123. The reversal of 12445121 is 12154421.

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: 12154421 = 163 ⋅74567.

It can be written as a sum of positive squares in 2 ways, for example, as 6195121 + 6250000 = 2489^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 12445121 - 2² = 12445117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12445093 and 12445102.

It is not an unprimeable number, because it can be changed into a prime (12445123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478646 + ... + 478671.

It is an arithmetic number, because the mean of its divisors is an integer number (3350613).

Almost surely, 2^12445121 is an apocalyptic number.

It is an amenable number.

12445121 is a deficient number, since it is larger than the sum of its proper divisors (957331).

12445121 is an equidigital number, since it uses as much as digits as its factorization.

12445121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957330.

The product of its digits is 320, while the sum is 20.

The square root of 12445121 is about 3527.7643061860. The cubic root of 12445121 is about 231.7393090922.

Adding to 12445121 its reverse (12154421), we get a palindrome (24599542).

The spelling of 12445121 in words is "twelve million, four hundred forty-five thousand, one hundred twenty-one".