12671921 has 2 divisors, whose sum is σ = 12671922. Its totient is φ = 12671920.

The previous prime is 12671887. The next prime is 12671951. The reversal of 12671921 is 12917621.

12671921 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., 9985600 + 2686321 = 3160^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 12671921 - 2²² = 8477617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12671951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6335960 + 6335961.

It is an arithmetic number, because the mean of its divisors is an integer number (6335961).

Almost surely, 2^12671921 is an apocalyptic number.

It is an amenable number.

12671921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12671921 is an equidigital number, since it uses as much as digits as its factorization.

12671921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 12671921 is about 3559.7641775826. The cubic root of 12671921 is about 233.1385828492.

The spelling of 12671921 in words is "twelve million, six hundred seventy-one thousand, nine hundred twenty-one".