2161707272 has 8 divisors (see below), whose sum is σ = 4053201150. Its totient is φ = 1080853632.

The previous prime is 2161707271. The next prime is 2161707307. The reversal of 2161707272 is 2727071612.

It can be written as a sum of positive squares in only one way, i.e., 1770221476 + 391485796 = 42074^2 + 19786^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 135106697 + ... + 135106712.

Almost surely, 2^2161707272 is an apocalyptic number.

It is an amenable number.

2161707272 is a deficient number, since it is larger than the sum of its proper divisors (1891493878).

2161707272 is a wasteful number, since it uses less digits than its factorization.

2161707272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270213415 (or 270213411 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 2161707272 is about 46494.1638488101. The cubic root of 2161707272 is about 1293.0012989597.

Adding to 2161707272 its reverse (2727071612), we get a palindrome (4888778884).

The spelling of 2161707272 in words is "two billion, one hundred sixty-one million, seven hundred seven thousand, two hundred seventy-two".