12821367651 has 4 divisors (see below), whose sum is σ = 17095156872. Its totient is φ = 8547578432.

The previous prime is 12821367619. The next prime is 12821367659. The reversal of 12821367651 is 15676312821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12821367651 - 2⁵ = 12821367619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12821367659) 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 3 ways as a sum of consecutive naturals, for example, 2136894606 + ... + 2136894611.

It is an arithmetic number, because the mean of its divisors is an integer number (4273789218).

Almost surely, 2^12821367651 is an apocalyptic number.

12821367651 is a deficient number, since it is larger than the sum of its proper divisors (4273789221).

12821367651 is an equidigital number, since it uses as much as digits as its factorization.

12821367651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273789220.

The product of its digits is 120960, while the sum is 42.

The spelling of 12821367651 in words is "twelve billion, eight hundred twenty-one million, three hundred sixty-seven thousand, six hundred fifty-one".