2102161 has 4 divisors (see below), whose sum is σ = 2109924. Its totient is φ = 2094400.

The previous prime is 2102143. The next prime is 2102167. The reversal of 2102161 is 1612012.

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 1638400 + 463761 = 1280^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102161 - 2¹¹ = 2100113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102167) 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, 3460 + ... + 4021.

It is an arithmetic number, because the mean of its divisors is an integer number (527481).

2^2102161 is an apocalyptic number.

It is an amenable number.

2102161 is a deficient number, since it is larger than the sum of its proper divisors (7763).

2102161 is an equidigital number, since it uses as much as digits as its factorization.

2102161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7762.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2102161 is about 1449.8830987359. The cubic root of 2102161 is about 128.1018273381.

Adding to 2102161 its reverse (1612012), we get a palindrome (3714173).

The spelling of 2102161 in words is "two million, one hundred two thousand, one hundred sixty-one".