12685821 has 8 divisors (see below), whose sum is σ = 17016384. Its totient is φ = 8406240.

The previous prime is 12685763. The next prime is 12685837. The reversal of 12685821 is 12858621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12685821 - 2¹⁹ = 12161533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12685861) 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 in 7 ways as a sum of consecutive naturals, for example, 12160 + ... + 13161.

It is an arithmetic number, because the mean of its divisors is an integer number (2127048).

Almost surely, 2^12685821 is an apocalyptic number.

It is an amenable number.

12685821 is a deficient number, since it is larger than the sum of its proper divisors (4330563).

12685821 is a wasteful number, since it uses less digits than its factorization.

12685821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25491.

The product of its digits is 7680, while the sum is 33.

The square root of 12685821 is about 3561.7160189998. The cubic root of 12685821 is about 233.2237959785.

The spelling of 12685821 in words is "twelve million, six hundred eighty-five thousand, eight hundred twenty-one".