2105867811 has 16 divisors (see below), whose sum is σ = 2817391104. Its totient is φ = 1399138944.

The previous prime is 2105867779. The next prime is 2105867867. The reversal of 2105867811 is 1187685012.

It is not a de Polignac number, because 2105867811 - 2⁵ = 2105867779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2105867811.

It is not an unprimeable number, because it can be changed into a prime (2105867891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2154955 + ... + 2155931.

It is an arithmetic number, because the mean of its divisors is an integer number (176086944).

Almost surely, 2^2105867811 is an apocalyptic number.

2105867811 is a deficient number, since it is larger than the sum of its proper divisors (711523293).

2105867811 is an equidigital number, since it uses as much as digits as its factorization.

2105867811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690.

The product of its (nonzero) digits is 26880, while the sum is 39.

The square root of 2105867811 is about 45889.7353555237. The cubic root of 2105867811 is about 1281.7707854070.

The spelling of 2105867811 in words is "two billion, one hundred five million, eight hundred sixty-seven thousand, eight hundred eleven".