2101984161 has 4 divisors (see below), whose sum is σ = 2802645552. Its totient is φ = 1401322772.

The previous prime is 2101984151. The next prime is 2101984169. The reversal of 2101984161 is 1614891012.

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 2101984161 - 2⁷ = 2101984033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101984169) 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, 350330691 + ... + 350330696.

It is an arithmetic number, because the mean of its divisors is an integer number (700661388).

Almost surely, 2^2101984161 is an apocalyptic number.

It is an amenable number.

2101984161 is a deficient number, since it is larger than the sum of its proper divisors (700661391).

2101984161 is an equidigital number, since it uses as much as digits as its factorization.

2101984161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700661390.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 2101984161 is about 45847.4008096424. The cubic root of 2101984161 is about 1280.9823515617.

The spelling of 2101984161 in words is "two billion, one hundred one million, nine hundred eighty-four thousand, one hundred sixty-one".