12673505821 has 2 divisors, whose sum is σ = 12673505822. Its totient is φ = 12673505820.

The previous prime is 12673505791. The next prime is 12673505863. The reversal of 12673505821 is 12850537621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11178832900 + 1494672921 = 105730^2 + 38661^2 .

It is a cyclic number.

It is not a de Polignac number, because 12673505821 - 2²¹ = 12671408669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12673506821) 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 as a sum of consecutive naturals, namely, 6336752910 + 6336752911.

It is an arithmetic number, because the mean of its divisors is an integer number (6336752911).

Almost surely, 2^12673505821 is an apocalyptic number.

It is an amenable number.

12673505821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12673505821 is an equidigital number, since it uses as much as digits as its factorization.

12673505821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 12673505821 in words is "twelve billion, six hundred seventy-three million, five hundred five thousand, eight hundred twenty-one".