11220211220 has 24 divisors (see below), whose sum is σ = 23569451304. Its totient is φ = 4486749696.

The previous prime is 11220211199. The next prime is 11220211267. The reversal of 11220211220 is 2211202211.

It can be written as a sum of positive squares in 4 ways, for example, as 110208004 + 11110003216 = 10498^2 + 105404^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11220211195 and 11220211204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13049 + ... + 150368.

It is an arithmetic number, because the mean of its divisors is an integer number (982060471).

Almost surely, 2^11220211220 is an apocalyptic number.

11220211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11220211220 is an abundant number, since it is smaller than the sum of its proper divisors (12349240084).

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

11220211220 is a wasteful number, since it uses less digits than its factorization.

11220211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166859 (or 166857 counting only the distinct ones).

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

Adding to 11220211220 its reverse (2211202211), we get a palindrome (13431413431).

Subtracting from 11220211220 its reverse (2211202211), we obtain a palindrome (9009009009).

The spelling of 11220211220 in words is "eleven billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty".