111220211221002 has 192 divisors, whose sum is σ = 267060692939040. Its totient is φ = 33243594227712.

The previous prime is 111220211220947. The next prime is 111220211221027. The reversal of 111220211221002 is 200122112022111.

111220211221002 is a `hidden beast` number, since 1 + 11 + 220 + 211 + 221 + 0 + 0 + 2 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 10987295754681 + 100232915466321 = 3314709^2 + 10011639^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 390574258 + ... + 390858914.

Almost surely, 2^{111220211221002} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111220211221002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133530346469520).

111220211221002 is an abundant number, since it is smaller than the sum of its proper divisors (155840481718038).

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

111220211221002 is a wasteful number, since it uses less digits than its factorization.

111220211221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285097 (or 285094 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111220211221002 its reverse (200122112022111), we get a palindrome (311342323243113).

The spelling of 111220211221002 in words is "one hundred eleven trillion, two hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, two".