11101221220 has 24 divisors (see below), whose sum is σ = 23330510784. Its totient is φ = 4437070176.

The previous prime is 11101221191. The next prime is 11101221227. The reversal of 11101221220 is 2212210111.

11101221220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11101221220² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11101221220.

It is not an unprimeable number, because it can be changed into a prime (11101221227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186934 + ... + 239053.

It is an arithmetic number, because the mean of its divisors is an integer number (972104616).

Almost surely, 2^11101221220 is an apocalyptic number.

11101221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11101221220 is an abundant number, since it is smaller than the sum of its proper divisors (12229289564).

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

11101221220 is a wasteful number, since it uses less digits than its factorization.

11101221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427299 (or 427297 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11101221220 its reverse (2212210111), we get a palindrome (13313431331).

The spelling of 11101221220 in words is "eleven billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty".