222217156 has 36 divisors (see below), whose sum is σ = 454114668. Its totient is φ = 94868928.

The previous prime is 222217147. The next prime is 222217159. The reversal of 222217156 is 651712222.

It can be written as a sum of positive squares in 2 ways, for example, as 63457156 + 158760000 = 7966^2 + 12600^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (222217159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52246 + ... + 56338.

Almost surely, 2^222217156 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 222217156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227057334).

222217156 is an abundant number, since it is smaller than the sum of its proper divisors (231897512).

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

222217156 is a wasteful number, since it uses less digits than its factorization.

222217156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388 (or 4379 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 222217156 is about 14906.9499227709. The cubic root of 222217156 is about 605.7022612740.

Adding to 222217156 its reverse (651712222), we get a palindrome (873929378).

The spelling of 222217156 in words is "two hundred twenty-two million, two hundred seventeen thousand, one hundred fifty-six".