12726121 has 4 divisors (see below), whose sum is σ = 12773700. Its totient is φ = 12678544.

The previous prime is 12726083. The next prime is 12726127. The reversal of 12726121 is 12162721.

It is a happy number.

12726121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12162721 = 149 ⋅81629.

It can be written as a sum of positive squares in 2 ways, for example, as 1132096 + 11594025 = 1064^2 + 3405^2 .

It is a cyclic number.

It is not a de Polignac number, because 12726121 - 2¹¹ = 12724073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12726092 and 12726101.

It is not an unprimeable number, because it can be changed into a prime (12726127) 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, 23386 + ... + 23923.

It is an arithmetic number, because the mean of its divisors is an integer number (3193425).

Almost surely, 2^12726121 is an apocalyptic number.

It is an amenable number.

12726121 is a deficient number, since it is larger than the sum of its proper divisors (47579).

12726121 is an equidigital number, since it uses as much as digits as its factorization.

12726121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47578.

The product of its digits is 336, while the sum is 22.

The square root of 12726121 is about 3567.3689184047. The cubic root of 12726121 is about 233.4705014343.

Adding to 12726121 its reverse (12162721), we get a palindrome (24888842).

The spelling of 12726121 in words is "twelve million, seven hundred twenty-six thousand, one hundred twenty-one".