11111201220 has 192 divisors, whose sum is σ = 36045434880. Its totient is φ = 2504950272.

The previous prime is 11111201219. The next prime is 11111201237. The reversal of 11111201220 is 2210211111.

11111201220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 11111201196 and 11111201205.

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 63 ways as a sum of consecutive naturals, for example, 18125634 + ... + 18126246.

It is an arithmetic number, because the mean of its divisors is an integer number (187736640).

Almost surely, 2^11111201220 is an apocalyptic number.

11111201220 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 11111201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18022717440).

11111201220 is an abundant number, since it is smaller than the sum of its proper divisors (24934233660).

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

11111201220 is a wasteful number, since it uses less digits than its factorization.

11111201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11111201220 its reverse (2210211111), we get a palindrome (13321412331).

The spelling of 11111201220 in words is "eleven billion, one hundred eleven million, two hundred one thousand, two hundred twenty".