12821491 has 2 divisors, whose sum is σ = 12821492. Its totient is φ = 12821490.

The previous prime is 12821477. The next prime is 12821503. The reversal of 12821491 is 19412821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12821491 - 2⁹ = 12820979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12821401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410745 + 6410746.

It is an arithmetic number, because the mean of its divisors is an integer number (6410746).

Almost surely, 2^12821491 is an apocalyptic number.

12821491 is a deficient number, since it is larger than the sum of its proper divisors (1).

12821491 is an equidigital number, since it uses as much as digits as its factorization.

12821491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 28.

The square root of 12821491 is about 3580.7109629234. The cubic root of 12821491 is about 234.0522626587.

The spelling of 12821491 in words is "twelve million, eight hundred twenty-one thousand, four hundred ninety-one".