12921697 has 4 divisors (see below), whose sum is σ = 12975556. Its totient is φ = 12867840.

The previous prime is 12921679. The next prime is 12921763. The reversal of 12921697 is 79612921.

12921697 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11566801 + 1354896 = 3401^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 12921697 - 2¹¹ = 12919649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12921397) 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 in 3 ways as a sum of consecutive naturals, for example, 26568 + ... + 27049.

It is an arithmetic number, because the mean of its divisors is an integer number (3243889).

Almost surely, 2^12921697 is an apocalyptic number.

It is an amenable number.

12921697 is a deficient number, since it is larger than the sum of its proper divisors (53859).

12921697 is an equidigital number, since it uses as much as digits as its factorization.

12921697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53858.

The product of its digits is 13608, while the sum is 37.

The square root of 12921697 is about 3594.6762023860. The cubic root of 12921697 is about 234.6604239885.

The spelling of 12921697 in words is "twelve million, nine hundred twenty-one thousand, six hundred ninety-seven".