2101995871 has 2 divisors, whose sum is σ = 2101995872. Its totient is φ = 2101995870.

The previous prime is 2101995869. The next prime is 2101995877. The reversal of 2101995871 is 1785991012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101995871 - 2¹ = 2101995869 is a prime.

Together with 2101995869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101995877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050997935 + 1050997936.

It is an arithmetic number, because the mean of its divisors is an integer number (1050997936).

Almost surely, 2^2101995871 is an apocalyptic number.

2101995871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101995871 is an equidigital number, since it uses as much as digits as its factorization.

2101995871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 43.

The square root of 2101995871 is about 45847.5285157226. The cubic root of 2101995871 is about 1280.9847303103.

The spelling of 2101995871 in words is "two billion, one hundred one million, nine hundred ninety-five thousand, eight hundred seventy-one".