2017172321 has 4 divisors (see below), whose sum is σ = 2017319700. Its totient is φ = 2017024944.

The previous prime is 2017172279. The next prime is 2017172341. The reversal of 2017172321 is 1232717102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1232717102 = 2 ⋅616358551.

It can be written as a sum of positive squares in 2 ways, for example, as 1311526225 + 705646096 = 36215^2 + 26564^2 .

It is a cyclic number.

It is not a de Polignac number, because 2017172321 - 2³⁰ = 943430497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2017172341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50786 + ... + 81323.

It is an arithmetic number, because the mean of its divisors is an integer number (504329925).

Almost surely, 2^2017172321 is an apocalyptic number.

It is an amenable number.

2017172321 is a deficient number, since it is larger than the sum of its proper divisors (147379).

2017172321 is a wasteful number, since it uses less digits than its factorization.

2017172321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147378.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 2017172321 is about 44912.9415758977. The cubic root of 2017172321 is about 1263.5167398403.

Adding to 2017172321 its reverse (1232717102), we get a palindrome (3249889423).

The spelling of 2017172321 in words is "two billion, seventeen million, one hundred seventy-two thousand, three hundred twenty-one".