111212221221200 has 480 divisors, whose sum is σ = 295880231953152. Its totient is φ = 39834685440000.

The previous prime is 111212221221191. The next prime is 111212221221203. The reversal of 111212221221200 is 2122122212111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212221221203) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 104621091869 + ... + 104621092931.

Almost surely, 2^{111212221221200} is an apocalyptic number.

111212221221200 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 111212221221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147940115976576).

111212221221200 is an abundant number, since it is smaller than the sum of its proper divisors (184668010731952).

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

111212221221200 is a wasteful number, since it uses less digits than its factorization.

111212221221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183 (or 2172 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111212221221200 its reverse (2122122212111), we get a palindrome (113334343433311).

It can be divided in two parts, 1112122 and 21221200, that added together give a palindrome (22333322).

The spelling of 111212221221200 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred".