2111891217 has 32 divisors (see below), whose sum is σ = 2929665024. Its totient is φ = 1352145600.

The previous prime is 2111891209. The next prime is 2111891219. The reversal of 2111891217 is 7121981112.

It is not a de Polignac number, because 2111891217 - 2³ = 2111891209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2111891219) 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, 4522018 + ... + 4522484.

It is an arithmetic number, because the mean of its divisors is an integer number (91552032).

Almost surely, 2^2111891217 is an apocalyptic number.

It is an amenable number.

2111891217 is a deficient number, since it is larger than the sum of its proper divisors (817773807).

2111891217 is a wasteful number, since it uses less digits than its factorization.

2111891217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949.

The product of its digits is 2016, while the sum is 33.

The square root of 2111891217 is about 45955.3176139606. The cubic root of 2111891217 is about 1282.9917035136.

The spelling of 2111891217 in words is "two billion, one hundred eleven million, eight hundred ninety-one thousand, two hundred seventeen".