12110091821 has 4 divisors (see below), whose sum is σ = 12227665632. Its totient is φ = 11992518012.

The previous prime is 12110091781. The next prime is 12110091827. The reversal of 12110091821 is 12819001121.

12110091821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12110091821 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 (12110091827) 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 3 ways as a sum of consecutive naturals, for example, 58786751 + ... + 58786956.

It is an arithmetic number, because the mean of its divisors is an integer number (3056916408).

Almost surely, 2^12110091821 is an apocalyptic number.

It is an amenable number.

12110091821 is a deficient number, since it is larger than the sum of its proper divisors (117573811).

12110091821 is a wasteful number, since it uses less digits than its factorization.

12110091821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117573810.

The product of its (nonzero) digits is 288, while the sum is 26.

Adding to 12110091821 its reverse (12819001121), we get a palindrome (24929092942).

The spelling of 12110091821 in words is "twelve billion, one hundred ten million, ninety-one thousand, eight hundred twenty-one".