2100161 has 4 divisors (see below), whose sum is σ = 2400192. Its totient is φ = 1800132.

The previous prime is 2100121. The next prime is 2100167. The reversal of 2100161 is 1610012.

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 a cyclic number.

It is not a de Polignac number, because 2100161 - 2⁶ = 2100097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100167) 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, 150005 + ... + 150018.

It is an arithmetic number, because the mean of its divisors is an integer number (600048).

2^2100161 is an apocalyptic number.

It is an amenable number.

2100161 is a deficient number, since it is larger than the sum of its proper divisors (300031).

2100161 is an equidigital number, since it uses as much as digits as its factorization.

2100161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300030.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 2100161 is about 1449.1932238318. The cubic root of 2100161 is about 128.0611890063.

Adding to 2100161 its reverse (1610012), we get a palindrome (3710173).

The spelling of 2100161 in words is "two million, one hundred thousand, one hundred sixty-one".