11011121220 has 48 divisors (see below), whose sum is σ = 33633972288. Its totient is φ = 2669362560.

The previous prime is 11011121201. The next prime is 11011121237. The reversal of 11011121220 is 2212111011.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 11011121196 and 11011121205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8341099 + ... + 8342418.

It is an arithmetic number, because the mean of its divisors is an integer number (700707756).

Almost surely, 2^11011121220 is an apocalyptic number.

11011121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11011121220 is an abundant number, since it is smaller than the sum of its proper divisors (22622851068).

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

11011121220 is a wasteful number, since it uses less digits than its factorization.

11011121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16683540 (or 16683538 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11011121220 its reverse (2212111011), we get a palindrome (13223232231).

It can be divided in two parts, 11011 and 121220, that added together give a palindrome (132231).

The spelling of 11011121220 in words is "eleven billion, eleven million, one hundred twenty-one thousand, two hundred twenty".