2101871 has 2 divisors, whose sum is σ = 2101872. Its totient is φ = 2101870.

The previous prime is 2101867. The next prime is 2101873. The reversal of 2101871 is 1781012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101871 - 2² = 2101867 is a prime.

Together with 2101873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050935 + 1050936.

It is an arithmetic number, because the mean of its divisors is an integer number (1050936).

2^2101871 is an apocalyptic number.

2101871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101871 is an equidigital number, since it uses as much as digits as its factorization.

2101871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 2101871 is about 1449.7830872237. The cubic root of 2101871 is about 128.0959363782.

Adding to 2101871 its reverse (1781012), we get a palindrome (3882883).

The spelling of 2101871 in words is "two million, one hundred one thousand, eight hundred seventy-one".