12904121 has 2 divisors, whose sum is σ = 12904122. Its totient is φ = 12904120.

The previous prime is 12904117. The next prime is 12904141. The reversal of 12904121 is 12140921.

12904121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (12904141) can be obtained adding 12904121 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9369721 + 3534400 = 3061^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 12904121 - 2² = 12904117 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12904093 and 12904102.

It is not a weakly prime, because it can be changed into another prime (12904141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6452060 + 6452061.

It is an arithmetic number, because the mean of its divisors is an integer number (6452061).

Almost surely, 2^12904121 is an apocalyptic number.

It is an amenable number.

12904121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12904121 is an equidigital number, since it uses as much as digits as its factorization.

12904121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 12904121 is about 3592.2306440428. The cubic root of 12904121 is about 234.5539812352.

The spelling of 12904121 in words is "twelve million, nine hundred four thousand, one hundred twenty-one".