11220121220 has 96 divisors (see below), whose sum is σ = 29539351296. Its totient is φ = 3477772800.

The previous prime is 11220121219. The next prime is 11220121249. The reversal of 11220121220 is 2212102211.

It is a super-2 number, since 2×11220121220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 11220121195 and 11220121204.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258614 + ... + 298866.

It is an arithmetic number, because the mean of its divisors is an integer number (307701576).

Almost surely, 2^11220121220 is an apocalyptic number.

11220121220 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 11220121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14769675648).

11220121220 is an abundant number, since it is smaller than the sum of its proper divisors (18319230076).

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

11220121220 is a wasteful number, since it uses less digits than its factorization.

11220121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40461 (or 40459 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 11220121220 its reverse (2212102211), we get a palindrome (13432223431).

The spelling of 11220121220 in words is "eleven billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty".