2161707273 has 24 divisors (see below), whose sum is σ = 3585610080. Its totient is φ = 1241170560.

The previous prime is 2161707271. The next prime is 2161707307. The reversal of 2161707273 is 3727071612.

2161707273 is a `hidden beast` number, since 216 + 170 + 7 + 273 = 666.

It is not a de Polignac number, because 2161707273 - 2¹ = 2161707271 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2161707271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 572736 + ... + 576497.

It is an arithmetic number, because the mean of its divisors is an integer number (149400420).

Almost surely, 2^2161707273 is an apocalyptic number.

It is an amenable number.

2161707273 is a deficient number, since it is larger than the sum of its proper divisors (1423902807).

2161707273 is a wasteful number, since it uses less digits than its factorization.

2161707273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149269 (or 1149266 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 2161707273 is about 46494.1638595641. The cubic root of 2161707273 is about 1293.0012991591.

Adding to 2161707273 its reverse (3727071612), we get a palindrome (5888778885).

The spelling of 2161707273 in words is "two billion, one hundred sixty-one million, seven hundred seven thousand, two hundred seventy-three".