2101899 has 4 divisors (see below), whose sum is σ = 2802536. Its totient is φ = 1401264.

The previous prime is 2101873. The next prime is 2101903. The reversal of 2101899 is 9981012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2101899 - 2⁵ = 2101867 is a prime.

It is a D-number.

It is a Duffinian number.

2101899 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350314 + ... + 350319.

It is an arithmetic number, because the mean of its divisors is an integer number (700634).

2^2101899 is an apocalyptic number.

2101899 is a deficient number, since it is larger than the sum of its proper divisors (700637).

2101899 is an equidigital number, since it uses as much as digits as its factorization.

2101899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700636.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2101899 is about 1449.7927438086. The cubic root of 2101899 is about 128.0965051842.

The spelling of 2101899 in words is "two million, one hundred one thousand, eight hundred ninety-nine".