2217230720 has 32 divisors (see below), whose sum is σ = 5300568720. Its totient is φ = 886892032.

The previous prime is 2217230693. The next prime is 2217230723. The reversal of 2217230720 is 270327122.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×2217230720² = 9832224131423436800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2217230720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217230723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1731572 + ... + 1732851.

Almost surely, 2^2217230720 is an apocalyptic number.

2217230720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2217230720 is an abundant number, since it is smaller than the sum of its proper divisors (3083338000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2217230720 is an equidigital number, since it uses as much as digits as its factorization.

2217230720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464442 (or 3464430 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 2217230720 is about 47087.4794398681. The cubic root of 2217230720 is about 1303.9780944041.

Adding to 2217230720 its reverse (270327122), we get a palindrome (2487557842).

The spelling of 2217230720 in words is "two billion, two hundred seventeen million, two hundred thirty thousand, seven hundred twenty".