2101807811 has 2 divisors, whose sum is σ = 2101807812.
Its totient is φ = 2101807810.
The previous prime is 2101807787. The next prime is 2101807823. The reversal of 2101807811 is 1187081012.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-2101807811 is a prime.
It is a super-2 number, since 2×21018078112 = 8835192148761223442, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (2101803811) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050903905 + 1050903906.
It is an arithmetic number, because the mean of its divisors is an integer number (1050903906).
Almost surely, 22101807811 is an apocalyptic number.
2101807811 is a deficient number, since it is larger than the sum of its proper divisors (1).
2101807811 is an equidigital number, since it uses as much as digits as its factorization.
2101807811 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 896, while the sum is 29.
The square root of 2101807811 is about 45845.4775414108.
The cubic root of 2101807811 is about 1280.9465270679.
Adding to 2101807811 its reverse (1187081012), we get a palindrome (3288888823).
The spelling of 2101807811 in words is "two billion, one hundred one million, eight hundred seven thousand, eight hundred eleven".