2161705206 has 32 divisors (see below), whose sum is σ = 4475870208. Its totient is φ = 695293920.

The previous prime is 2161705199. The next prime is 2161705229. The reversal of 2161705206 is 6025071612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47796 + ... + 81288.

It is an arithmetic number, because the mean of its divisors is an integer number (139870944).

Almost surely, 2^2161705206 is an apocalyptic number.

2161705206 is an abundant number, since it is smaller than the sum of its proper divisors (2314165002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161705206 is a wasteful number, since it uses less digits than its factorization.

2161705206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33876.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 2161705206 is about 46494.1416309625. The cubic root of 2161705206 is about 1293.0008870412. Note that the first 3 decimals are identical.

Adding to 2161705206 its reverse (6025071612), we get a palindrome (8186776818).

The spelling of 2161705206 in words is "two billion, one hundred sixty-one million, seven hundred five thousand, two hundred six".