1222166220 has 96 divisors (see below), whose sum is σ = 3803708160. Its totient is φ = 290684160.

The previous prime is 1222166213. The next prime is 1222166221. The reversal of 1222166220 is 226612221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1222166221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17511 + ... + 52449.

It is an arithmetic number, because the mean of its divisors is an integer number (39621960).

Almost surely, 2^1222166220 is an apocalyptic number.

1222166220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222166220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1901854080).

1222166220 is an abundant number, since it is smaller than the sum of its proper divisors (2581541940).

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

1222166220 is a wasteful number, since it uses less digits than its factorization.

1222166220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35015 (or 35013 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1222166220 is about 34959.4939894730. The cubic root of 1222166220 is about 1069.1617798355.

Adding to 1222166220 its reverse (226612221), we get a palindrome (1448778441).

The spelling of 1222166220 in words is "one billion, two hundred twenty-two million, one hundred sixty-six thousand, two hundred twenty".