12821808585 has 64 divisors (see below), whose sum is σ = 21318992640. Its totient is φ = 6575923200.

The previous prime is 12821808583. The next prime is 12821808613. The reversal of 12821808585 is 58580812821.

It is not a de Polignac number, because 12821808585 - 2¹ = 12821808583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12821808583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23019127 + ... + 23019683.

It is an arithmetic number, because the mean of its divisors is an integer number (333109260).

Almost surely, 2^12821808585 is an apocalyptic number.

12821808585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12821808585 is a deficient number, since it is larger than the sum of its proper divisors (8497184055).

12821808585 is a wasteful number, since it uses less digits than its factorization.

12821808585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098.

The product of its (nonzero) digits is 409600, while the sum is 48.

The spelling of 12821808585 in words is "twelve billion, eight hundred twenty-one million, eight hundred eight thousand, five hundred eighty-five".