16815271121 has 4 divisors (see below), whose sum is σ = 18343932144. Its totient is φ = 15286610100.

The previous prime is 16815271103. The next prime is 16815271171. The reversal of 16815271121 is 12117251861.

16815271121 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-16815271121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16815271171) 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, 764330495 + ... + 764330516.

It is an arithmetic number, because the mean of its divisors is an integer number (4585983036).

Almost surely, 2^16815271121 is an apocalyptic number.

16815271121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16815271121 is a deficient number, since it is larger than the sum of its proper divisors (1528661023).

16815271121 is a wasteful number, since it uses less digits than its factorization.

16815271121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528661022.

The product of its digits is 6720, while the sum is 35.

The spelling of 16815271121 in words is "sixteen billion, eight hundred fifteen million, two hundred seventy-one thousand, one hundred twenty-one".