2217082321 has 4 divisors (see below), whose sum is σ = 2217176500. Its totient is φ = 2216988144.

The previous prime is 2217082297. The next prime is 2217082331. The reversal of 2217082321 is 1232807122.

2217082321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1612905921 + 604176400 = 40161^2 + 24580^2 .

It is a cyclic number.

It is not a de Polignac number, because 2217082321 - 2²⁹ = 1680211409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2217082321.

It is not an unprimeable number, because it can be changed into a prime (2217082331) 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, 22735 + ... + 70363.

It is an arithmetic number, because the mean of its divisors is an integer number (554294125).

Almost surely, 2^2217082321 is an apocalyptic number.

It is an amenable number.

2217082321 is a deficient number, since it is larger than the sum of its proper divisors (94179).

2217082321 is an equidigital number, since it uses as much as digits as its factorization.

2217082321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94178.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2217082321 is about 47085.9036336779. The cubic root of 2217082321 is about 1303.9490020532.

Adding to 2217082321 its reverse (1232807122), we get a palindrome (3449889443).

The spelling of 2217082321 in words is "two billion, two hundred seventeen million, eighty-two thousand, three hundred twenty-one".