111101312321220 has 192 divisors, whose sum is σ = 336063168000000. Its totient is φ = 27262355787264.

The previous prime is 111101312321203. The next prime is 111101312321227. The reversal of 111101312321220 is 22123213101111.

It is not an unprimeable number, because it can be changed into a prime (111101312321227) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 822911281 + ... + 823046279.

It is an arithmetic number, because the mean of its divisors is an integer number (1750329000000).

Almost surely, 2^{111101312321220} is an apocalyptic number.

111101312321220 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 111101312321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168031584000000).

111101312321220 is an abundant number, since it is smaller than the sum of its proper divisors (224961855678780).

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

111101312321220 is a wasteful number, since it uses less digits than its factorization.

111101312321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138322 (or 138320 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 111101312321220 its reverse (22123213101111), we get a palindrome (133224525422331).

The spelling of 111101312321220 in words is "one hundred eleven trillion, one hundred one billion, three hundred twelve million, three hundred twenty-one thousand, two hundred twenty".