2128811171 has 4 divisors (see below), whose sum is σ = 2129946000. Its totient is φ = 2127676344.

The previous prime is 2128811119. The next prime is 2128811173. The reversal of 2128811171 is 1711188212.

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 2128811171 - 2²² = 2124616867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2128811173) 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, 564596 + ... + 568353.

It is an arithmetic number, because the mean of its divisors is an integer number (532486500).

Almost surely, 2^2128811171 is an apocalyptic number.

2128811171 is a deficient number, since it is larger than the sum of its proper divisors (1134829).

2128811171 is a wasteful number, since it uses less digits than its factorization.

2128811171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134828.

The product of its digits is 1792, while the sum is 32.

The square root of 2128811171 is about 46139.0417217350. The cubic root of 2128811171 is about 1286.4089318909.

Adding to 2128811171 its reverse (1711188212), we get a palindrome (3839999383).

The spelling of 2128811171 in words is "two billion, one hundred twenty-eight million, eight hundred eleven thousand, one hundred seventy-one".