12876821197 has 4 divisors (see below), whose sum is σ = 12877599996. Its totient is φ = 12876042400.

The previous prime is 12876821131. The next prime is 12876821249. The reversal of 12876821197 is 79112867821.

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 11756848041 + 1119973156 = 108429^2 + 33466^2 .

It is a cyclic number.

It is not a de Polignac number, because 12876821197 - 2¹¹ = 12876819149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12876821107) 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, 364048 + ... + 397849.

It is an arithmetic number, because the mean of its divisors is an integer number (3219399999).

Almost surely, 2^12876821197 is an apocalyptic number.

It is an amenable number.

12876821197 is a deficient number, since it is larger than the sum of its proper divisors (778799).

12876821197 is an equidigital number, since it uses as much as digits as its factorization.

12876821197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778798.

The product of its digits is 677376, while the sum is 52.

The spelling of 12876821197 in words is "twelve billion, eight hundred seventy-six million, eight hundred twenty-one thousand, one hundred ninety-seven".