1222571220 has 96 divisors (see below), whose sum is σ = 3697964928. Its totient is φ = 300006912.

The previous prime is 1222571213. The next prime is 1222571261. The reversal of 1222571220 is 221752221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268402 + ... + 272918.

It is an arithmetic number, because the mean of its divisors is an integer number (38520468).

Almost surely, 2^1222571220 is an apocalyptic number.

1222571220 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 1222571220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1848982464).

1222571220 is an abundant number, since it is smaller than the sum of its proper divisors (2475393708).

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

1222571220 is a wasteful number, since it uses less digits than its factorization.

1222571220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4889 (or 4887 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 1222571220 is about 34965.2859276168. The cubic root of 1222571220 is about 1069.2798659824.

The spelling of 1222571220 in words is "one billion, two hundred twenty-two million, five hundred seventy-one thousand, two hundred twenty".