11121203220 has 96 divisors (see below), whose sum is σ = 32083890048. Its totient is φ = 2876216832.

The previous prime is 11121203207. The next prime is 11121203237. The reversal of 11121203220 is 2230212111.

It is a super-2 number, since 2×11121203220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11121203220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 695839 + ... + 711641.

It is an arithmetic number, because the mean of its divisors is an integer number (334207188).

Almost surely, 2^11121203220 is an apocalyptic number.

11121203220 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 11121203220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16041945024).

11121203220 is an abundant number, since it is smaller than the sum of its proper divisors (20962686828).

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

11121203220 is a wasteful number, since it uses less digits than its factorization.

11121203220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16169 (or 16167 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 11121203220 its reverse (2230212111), we get a palindrome (13351415331).

The spelling of 11121203220 in words is "eleven billion, one hundred twenty-one million, two hundred three thousand, two hundred twenty".