11221011220 has 24 divisors (see below), whose sum is σ = 23627313864. Its totient is φ = 4476368256.

The previous prime is 11221011169. The next prime is 11221011233. The reversal of 11221011220 is 2211012211.

It can be written as a sum of positive squares in 4 ways, for example, as 3343383684 + 7877627536 = 57822^2 + 88756^2 .

It is a super-2 number, since 2×11221011220² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11221011220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 744619 + ... + 759538.

It is an arithmetic number, because the mean of its divisors is an integer number (984471411).

Almost surely, 2^11221011220 is an apocalyptic number.

11221011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221011220 is an abundant number, since it is smaller than the sum of its proper divisors (12406302644).

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

11221011220 is a wasteful number, since it uses less digits than its factorization.

11221011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504539 (or 1504537 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11221011220 its reverse (2211012211), we get a palindrome (13432023431).

Subtracting from 11221011220 its reverse (2211012211), we obtain a palindrome (9009999009).

The spelling of 11221011220 in words is "eleven billion, two hundred twenty-one million, eleven thousand, two hundred twenty".