2118105 has 36 divisors (see below), whose sum is σ = 4045860. Its totient is φ = 1024320.

The previous prime is 2118091. The next prime is 2118113. The reversal of 2118105 is 5018112.

It can be written as a sum of positive squares in 2 ways, for example, as 627264 + 1490841 = 792^2 + 1221^2 .

It is not a de Polignac number, because 2118105 - 2⁴ = 2118089 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5251 + ... + 5639.

It is an arithmetic number, because the mean of its divisors is an integer number (112385).

2^2118105 is an apocalyptic number.

It is an amenable number.

2118105 is a deficient number, since it is larger than the sum of its proper divisors (1927755).

2118105 is a wasteful number, since it uses less digits than its factorization.

2118105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 2118105 is about 1455.3710866992. The cubic root of 2118105 is about 128.4248779931.

The spelling of 2118105 in words is "two million, one hundred eighteen thousand, one hundred five".