2101804 has 12 divisors (see below), whose sum is σ = 3805200. Its totient is φ = 1014608.

The previous prime is 2101789. The next prime is 2101807. The reversal of 2101804 is 4081012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2101807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8944 + ... + 9175.

It is an arithmetic number, because the mean of its divisors is an integer number (317100).

2^2101804 is an apocalyptic number.

It is an amenable number.

2101804 is a deficient number, since it is larger than the sum of its proper divisors (1703396).

2101804 is a wasteful number, since it uses less digits than its factorization.

2101804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18152 (or 18150 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 2101804 is about 1449.7599801346. The cubic root of 2101804 is about 128.0945752863.

Adding to 2101804 its reverse (4081012), we get a palindrome (6182816).

The spelling of 2101804 in words is "two million, one hundred one thousand, eight hundred four".