12821818659 has 32 divisors (see below), whose sum is σ = 20519815680. Its totient is φ = 7035351552.

The previous prime is 12821818649. The next prime is 12821818673. The reversal of 12821818659 is 95681812821.

It is not a de Polignac number, because 12821818659 - 2⁵ = 12821818627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (12821818649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 496327 + ... + 521520.

It is an arithmetic number, because the mean of its divisors is an integer number (641244240).

Almost surely, 2^12821818659 is an apocalyptic number.

12821818659 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12821818659 is a deficient number, since it is larger than the sum of its proper divisors (7697997021).

12821818659 is a wasteful number, since it uses less digits than its factorization.

12821818659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017899.

The product of its digits is 552960, while the sum is 51.

The spelling of 12821818659 in words is "twelve billion, eight hundred twenty-one million, eight hundred eighteen thousand, six hundred fifty-nine".