2101803811 has 2 divisors, whose sum is σ = 2101803812. Its totient is φ = 2101803810.

The previous prime is 2101803791. The next prime is 2101803827. The reversal of 2101803811 is 1183081012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101803811 - 2¹¹ = 2101801763 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101807811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050901905 + 1050901906.

It is an arithmetic number, because the mean of its divisors is an integer number (1050901906).

Almost surely, 2^2101803811 is an apocalyptic number.

2101803811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101803811 is an equidigital number, since it uses as much as digits as its factorization.

2101803811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 2101803811 is about 45845.4339165854. The cubic root of 2101803811 is about 1280.9457144675.

Adding to 2101803811 its reverse (1183081012), we get a palindrome (3284884823).

The spelling of 2101803811 in words is "two billion, one hundred one million, eight hundred three thousand, eight hundred eleven".