12821684 has 24 divisors (see below), whose sum is σ = 23617608. Its totient is φ = 6082560.

The previous prime is 12821681. The next prime is 12821687. The reversal of 12821684 is 48612821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12821681) and next prime (12821687).

It can be written as a sum of positive squares in 4 ways, for example, as 19600 + 12802084 = 140^2 + 3578^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12821684.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12821681) 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 7 ways as a sum of consecutive naturals, for example, 5012 + ... + 7124.

It is an arithmetic number, because the mean of its divisors is an integer number (984067).

Almost surely, 2^12821684 is an apocalyptic number.

It is an amenable number.

12821684 is a deficient number, since it is larger than the sum of its proper divisors (10795924).

12821684 is a wasteful number, since it uses less digits than its factorization.

12821684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195 (or 2193 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 12821684 is about 3580.7379127772. The cubic root of 12821684 is about 234.0534370375.

It can be divided in two parts, 128 and 21684, that added together give a palindrome (21812).

The spelling of 12821684 in words is "twelve million, eight hundred twenty-one thousand, six hundred eighty-four".