12818288027821 has 4 divisors (see below), whose sum is σ = 13572304970652. Its totient is φ = 12064271084992.

The previous prime is 12818288027807. The next prime is 12818288027827. The reversal of 12818288027821 is 12872088281821.

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 6632427622500 + 6185860405321 = 2575350^2 + 2487139^2 .

It is a cyclic number.

It is not a de Polignac number, because 12818288027821 - 2⁵ = 12818288027789 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12818288027827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377008471390 + ... + 377008471423.

It is an arithmetic number, because the mean of its divisors is an integer number (3393076242663).

Almost surely, 2^{12818288027821} is an apocalyptic number.

It is an amenable number.

12818288027821 is a deficient number, since it is larger than the sum of its proper divisors (754016942831).

12818288027821 is an equidigital number, since it uses as much as digits as its factorization.

12818288027821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754016942830.

The product of its (nonzero) digits is 3670016, while the sum is 58.

The spelling of 12818288027821 in words is "twelve trillion, eight hundred eighteen billion, two hundred eighty-eight million, twenty-seven thousand, eight hundred twenty-one".