12753991821 has 32 divisors (see below), whose sum is σ = 18656179200. Its totient is φ = 7715312640.

The previous prime is 12753991799. The next prime is 12753991837. The reversal of 12753991821 is 12819935721.

It is a happy number.

12753991821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12753991821 - 2⁹ = 12753991309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12753991321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 410295 + ... + 440283.

It is an arithmetic number, because the mean of its divisors is an integer number (583005600).

Almost surely, 2^12753991821 is an apocalyptic number.

It is an amenable number.

12753991821 is a deficient number, since it is larger than the sum of its proper divisors (5902187379).

12753991821 is a wasteful number, since it uses less digits than its factorization.

12753991821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30309.

The product of its digits is 272160, while the sum is 48.

The spelling of 12753991821 in words is "twelve billion, seven hundred fifty-three million, nine hundred ninety-one thousand, eight hundred twenty-one".