2101705 has 4 divisors (see below), whose sum is σ = 2522052. Its totient is φ = 1681360.

The previous prime is 2101703. The next prime is 2101721. The reversal of 2101705 is 5071012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1530169 + 571536 = 1237^2 + 756^2 .

It is not a de Polignac number, because 2101705 - 2¹ = 2101703 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2101703) 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 3 ways as a sum of consecutive naturals, for example, 210166 + ... + 210175.

It is an arithmetic number, because the mean of its divisors is an integer number (630513).

2^2101705 is an apocalyptic number.

It is an amenable number.

2101705 is a deficient number, since it is larger than the sum of its proper divisors (420347).

2101705 is an equidigital number, since it uses as much as digits as its factorization.

2101705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420346.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 2101705 is about 1449.7258361497. The cubic root of 2101705 is about 128.0925640677.

Adding to 2101705 its reverse (5071012), we get a palindrome (7172717).

The spelling of 2101705 in words is "two million, one hundred one thousand, seven hundred five".