111221101222110 has 384 divisors, whose sum is σ = 324681868772352. Its totient is φ = 26187017472000.

The previous prime is 111221101222103. The next prime is 111221101222111. The reversal of 111221101222110 is 11222101122111.

It is a happy number.

111221101222110 is a `hidden beast` number, since 1 + 11 + 221 + 101 + 222 + 110 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221101222111) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4376875305 + ... + 4376900715.

It is an arithmetic number, because the mean of its divisors is an integer number (845525699928).

Almost surely, 2^{111221101222110} is an apocalyptic number.

111221101222110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111221101222110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162340934386176).

111221101222110 is an abundant number, since it is smaller than the sum of its proper divisors (213460767550242).

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

111221101222110 is a wasteful number, since it uses less digits than its factorization.

111221101222110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26432 (or 26429 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111221101222110 its reverse (11222101122111), we get a palindrome (122443202344221).

Subtracting from 111221101222110 its reverse (11222101122111), we obtain a palindrome (99999000099999).

The spelling of 111221101222110 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty-two thousand, one hundred ten".