2173216 has 24 divisors (see below), whose sum is σ = 4323564. Its totient is φ = 1075200.

The previous prime is 2173207. The next prime is 2173219. The reversal of 2173216 is 6123712.

It can be written as a sum of positive squares in 2 ways, for example, as 2131600 + 41616 = 1460^2 + 204^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173219) 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, 3316 + ... + 3916.

2^2173216 is an apocalyptic number.

It is an amenable number.

2173216 is a deficient number, since it is larger than the sum of its proper divisors (2150348).

2173216 is a wasteful number, since it uses less digits than its factorization.

2173216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 716 counting only the distinct ones).

The product of its digits is 504, while the sum is 22.

The square root of 2173216 is about 1474.1831636537. The cubic root of 2173216 is about 129.5291844999.

Subtracting from 2173216 its product of digits (504), we obtain a palindrome (2172712).

Adding to 2173216 its reverse (6123712), we get a palindrome (8296928).

It can be divided in two parts, 21 and 73216, that added together give a palindrome (73237).

The spelling of 2173216 in words is "two million, one hundred seventy-three thousand, two hundred sixteen".