111220221000 has 256 divisors, whose sum is σ = 400226112000. Its totient is φ = 25188019200.

The previous prime is 111220220921. The next prime is 111220221001. The reversal of 111220221000 is 122022111.

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

It is not an unprimeable number, because it can be changed into a prime (111220221001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2264706 + ... + 2313294.

It is an arithmetic number, because the mean of its divisors is an integer number (1563383250).

Almost surely, 2^111220221000 is an apocalyptic number.

111220221000 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 111220221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200113056000).

111220221000 is an abundant number, since it is smaller than the sum of its proper divisors (289005891000).

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

111220221000 is a wasteful number, since it uses less digits than its factorization.

111220221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48729 (or 48715 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 111220221000 its reverse (122022111), we get a palindrome (111342243111).

The spelling of 111220221000 in words is "one hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand".