11121210220 has 24 divisors (see below), whose sum is σ = 23362892784. Its totient is φ = 4446893376.

The previous prime is 11121210211. The next prime is 11121210223. The reversal of 11121210220 is 2201212111.

It is a self number, because there is not a number n which added to its sum of digits gives 11121210220.

It is not an unprimeable number, because it can be changed into a prime (11121210223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41262 + ... + 154741.

It is an arithmetic number, because the mean of its divisors is an integer number (973453866).

Almost surely, 2^11121210220 is an apocalyptic number.

11121210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11121210220 is an abundant number, since it is smaller than the sum of its proper divisors (12241682564).

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

11121210220 is a wasteful number, since it uses less digits than its factorization.

11121210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198849 (or 198847 counting only the distinct ones).

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

Adding to 11121210220 its reverse (2201212111), we get a palindrome (13322422331).

The spelling of 11121210220 in words is "eleven billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty".