18106095821 has 4 divisors (see below), whose sum is σ = 19752104544. Its totient is φ = 16460087100.

The previous prime is 18106095781. The next prime is 18106095829. The reversal of 18106095821 is 12859060181.

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-18106095821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18106095829) 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, 823004345 + ... + 823004366.

It is an arithmetic number, because the mean of its divisors is an integer number (4938026136).

Almost surely, 2^18106095821 is an apocalyptic number.

18106095821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18106095821 is a deficient number, since it is larger than the sum of its proper divisors (1646008723).

18106095821 is a wasteful number, since it uses less digits than its factorization.

18106095821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646008722.

The product of its (nonzero) digits is 34560, while the sum is 41.

The spelling of 18106095821 in words is "eighteen billion, one hundred six million, ninety-five thousand, eight hundred twenty-one".