11331122220 has 144 divisors (see below), whose sum is σ = 37917603360. Its totient is φ = 2716032000.

The previous prime is 11331122219. The next prime is 11331122249. The reversal of 11331122220 is 2222113311.

11331122220 is a `hidden beast` number, since 113 + 311 + 22 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 11331122193 and 11331122202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144070 + ... + 208370.

It is an arithmetic number, because the mean of its divisors is an integer number (263316690).

Almost surely, 2^11331122220 is an apocalyptic number.

11331122220 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 11331122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18958801680).

11331122220 is an abundant number, since it is smaller than the sum of its proper divisors (26586481140).

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

11331122220 is a wasteful number, since it uses less digits than its factorization.

11331122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64416 (or 64411 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 11331122220 its reverse (2222113311), we get a palindrome (13553235531).

It can be divided in two parts, 113311 and 22220, that added together give a palindrome (135531).

The spelling of 11331122220 in words is "eleven billion, three hundred thirty-one million, one hundred twenty-two thousand, two hundred twenty".