2161101 has 4 divisors (see below), whose sum is σ = 2881472. Its totient is φ = 1440732.

The previous prime is 2161087. The next prime is 2161121. The reversal of 2161101 is 1011612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2161101 - 2⁹ = 2160589 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360181 + ... + 360186.

It is an arithmetic number, because the mean of its divisors is an integer number (720368).

2^2161101 is an apocalyptic number.

It is an amenable number.

2161101 is a deficient number, since it is larger than the sum of its proper divisors (720371).

2161101 is an equidigital number, since it uses as much as digits as its factorization.

2161101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720370.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 2161101 is about 1470.0683657572. The cubic root of 2161101 is about 129.2880409360.

Adding to 2161101 its reverse (1011612), we get a palindrome (3172713).

The spelling of 2161101 in words is "two million, one hundred sixty-one thousand, one hundred one".