2217222756 has 216 divisors, whose sum is σ = 6977801376. Its totient is φ = 589800960.

The previous prime is 2217222751. The next prime is 2217222757. The reversal of 2217222756 is 6572227122.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2217222756.

It is not an unprimeable number, because it can be changed into a prime (2217222751) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3208371 + ... + 3209061.

It is an arithmetic number, because the mean of its divisors is an integer number (32304636).

Almost surely, 2^2217222756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2217222756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3488900688).

2217222756 is an abundant number, since it is smaller than the sum of its proper divisors (4760578620).

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

2217222756 is a wasteful number, since it uses less digits than its factorization.

2217222756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 827 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 2217222756 is about 47087.3948737876. The cubic root of 2217222756 is about 1303.9765331632.

Adding to 2217222756 its reverse (6572227122), we get a palindrome (8789449878).

The spelling of 2217222756 in words is "two billion, two hundred seventeen million, two hundred twenty-two thousand, seven hundred fifty-six".