111212221100 has 72 divisors (see below), whose sum is σ = 247852105200. Its totient is φ = 43297696000.

The previous prime is 111212221079. The next prime is 111212221111. The reversal of 111212221100 is 1122212111.

111212221100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 502586 + ... + 689214.

It is an arithmetic number, because the mean of its divisors is an integer number (3442390350).

Almost surely, 2^111212221100 is an apocalyptic number.

111212221100 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 111212221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123926052600).

111212221100 is an abundant number, since it is smaller than the sum of its proper divisors (136639884100).

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

111212221100 is a wasteful number, since it uses less digits than its factorization.

111212221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186803 (or 186796 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111212221100 its reverse (1122212111), we get a palindrome (112334433211).

The spelling of 111212221100 in words is "one hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, one hundred".