11012321220 has 96 divisors (see below), whose sum is σ = 31204992000. Its totient is φ = 2901467520.

The previous prime is 11012321219. The next prime is 11012321233. The reversal of 11012321220 is 2212321011.

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 11012321220.

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, 3082035 + ... + 3085605.

It is an arithmetic number, because the mean of its divisors is an integer number (325052000).

Almost surely, 2^11012321220 is an apocalyptic number.

11012321220 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 11012321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15602496000).

11012321220 is an abundant number, since it is smaller than the sum of its proper divisors (20192670780).

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

11012321220 is a wasteful number, since it uses less digits than its factorization.

11012321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4185 (or 4183 counting only the distinct ones).

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

Adding to 11012321220 its reverse (2212321011), we get a palindrome (13224642231).

The spelling of 11012321220 in words is "eleven billion, twelve million, three hundred twenty-one thousand, two hundred twenty".