12895921 has 2 divisors, whose sum is σ = 12895922. Its totient is φ = 12895920.

The previous prime is 12895919. The next prime is 12895963. The reversal of 12895921 is 12959821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 505521 = 3520^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 12895921 - 2¹ = 12895919 is a prime.

Together with 12895919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12895901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6447960 + 6447961.

It is an arithmetic number, because the mean of its divisors is an integer number (6447961).

Almost surely, 2^12895921 is an apocalyptic number.

It is an amenable number.

12895921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12895921 is an equidigital number, since it uses as much as digits as its factorization.

12895921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 12895921 is about 3591.0891105624. The cubic root of 12895921 is about 234.5042878029.

The spelling of 12895921 in words is "twelve million, eight hundred ninety-five thousand, nine hundred twenty-one".