111220111220100 has 144 divisors (see below), whose sum is σ = 322353889905600. Its totient is φ = 29607367864320.

The previous prime is 111220111220077. The next prime is 111220111220137. The reversal of 111220111220100 is 1022111022111.

It is a happy number.

It is a super-2 number, since 2×111220111220100² (a number of 29 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 111220111220100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1888353852 + ... + 1888412748.

It is an arithmetic number, because the mean of its divisors is an integer number (2238568679900).

Almost surely, 2^{111220111220100} is an apocalyptic number.

111220111220100 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 111220111220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161176944952800).

111220111220100 is an abundant number, since it is smaller than the sum of its proper divisors (211133778685500).

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

111220111220100 is a wasteful number, since it uses less digits than its factorization.

111220111220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69702 (or 69695 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111220111220100 its reverse (1022111022111), we get a palindrome (112242222242211).

The spelling of 111220111220100 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty thousand, one hundred".