2101818 has 32 divisors (see below), whose sum is σ = 4492800. Its totient is φ = 653616.

The previous prime is 2101817. The next prime is 2101823. The reversal of 2101818 is 8181012.

It is an alternating number because its digits alternate between even and odd.

2101818 is a modest number, since divided by 1818 gives 210 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 2101794 and 2101803.

It is not an unprimeable number, because it can be changed into a prime (2101811) 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 15 ways as a sum of consecutive naturals, for example, 11653 + ... + 11831.

It is an arithmetic number, because the mean of its divisors is an integer number (140400).

2^2101818 is an apocalyptic number.

2101818 is an abundant number, since it is smaller than the sum of its proper divisors (2390982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101818 is a wasteful number, since it uses less digits than its factorization.

2101818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 2101818 is about 1449.7648085121. The cubic root of 2101818 is about 128.0948596960.

The spelling of 2101818 in words is "two million, one hundred one thousand, eight hundred eighteen".