11220311220 has 48 divisors (see below), whose sum is σ = 31443897408. Its totient is φ = 2989509120.

The previous prime is 11220311197. The next prime is 11220311233. The reversal of 11220311220 is 2211302211.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11220311220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9589 + ... + 150108.

It is an arithmetic number, because the mean of its divisors is an integer number (655081196).

Almost surely, 2^11220311220 is an apocalyptic number.

11220311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11220311220 is an abundant number, since it is smaller than the sum of its proper divisors (20223586188).

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

11220311220 is a wasteful number, since it uses less digits than its factorization.

11220311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160880 (or 160878 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 11220311220 its reverse (2211302211), we get a palindrome (13431613431).

Subtracting from 11220311220 its reverse (2211302211), we obtain a palindrome (9009009009).

The spelling of 11220311220 in words is "eleven billion, two hundred twenty million, three hundred eleven thousand, two hundred twenty".