12403121 has 2 divisors, whose sum is σ = 12403122. Its totient is φ = 12403120.

The previous prime is 12403087. The next prime is 12403123. The reversal of 12403121 is 12130421.

12403121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8620096 + 3783025 = 2936^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 12403121 - 2⁶ = 12403057 is a prime.

Together with 12403123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12403096 and 12403105.

It is not a weakly prime, because it can be changed into another prime (12403123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6201560 + 6201561.

It is an arithmetic number, because the mean of its divisors is an integer number (6201561).

Almost surely, 2^12403121 is an apocalyptic number.

It is an amenable number.

12403121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12403121 is an equidigital number, since it uses as much as digits as its factorization.

12403121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 12403121 is about 3521.8064966718. The cubic root of 12403121 is about 231.4783227280.

Adding to 12403121 its reverse (12130421), we get a palindrome (24533542).

The spelling of 12403121 in words is "twelve million, four hundred three thousand, one hundred twenty-one".