111221220000 has 480 divisors, whose sum is σ = 407353605120. Its totient is φ = 26328960000.

The previous prime is 111221219983. The next prime is 111221220013. The reversal of 111221220000 is 22122111.

It is a tau number, because it is divible by the number of its divisors (480).

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 28378041 + ... + 28381959.

It is an arithmetic number, because the mean of its divisors is an integer number (848653344).

Almost surely, 2^111221220000 is an apocalyptic number.

111221220000 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 111221220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203676802560).

111221220000 is an abundant number, since it is smaller than the sum of its proper divisors (296132385120).

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

111221220000 is a wasteful number, since it uses less digits than its factorization.

111221220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006 (or 3983 counting only the distinct ones).

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

Adding to 111221220000 its reverse (22122111), we get a palindrome (111243342111).

The spelling of 111221220000 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand".