1101222220 has 144 divisors (see below), whose sum is σ = 2809497600. Its totient is φ = 354993408.

The previous prime is 1101222193. The next prime is 1101222223. The reversal of 1101222220 is 222221011.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1101222220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101222223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5533681 + ... + 5533879.

It is an arithmetic number, because the mean of its divisors is an integer number (19510400).

Almost surely, 2^1101222220 is an apocalyptic number.

1101222220 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 1101222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1404748800).

1101222220 is an abundant number, since it is smaller than the sum of its proper divisors (1708275380).

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

1101222220 is a wasteful number, since it uses less digits than its factorization.

1101222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1101222220 is about 33184.6684479445. The cubic root of 1101222220 is about 1032.6622992156.

Adding to 1101222220 its reverse (222221011), we get a palindrome (1323443231).

The spelling of 1101222220 in words is "one billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty".