111001220121220 has 144 divisors (see below), whose sum is σ = 275372230996800. Its totient is φ = 37257422092800.

The previous prime is 111001220121191. The next prime is 111001220121227. The reversal of 111001220121220 is 22121022100111.

It is a junction number, because it is equal to n+sod(n) for n = 111001220121194 and 111001220121203.

It is not an unprimeable number, because it can be changed into a prime (111001220121227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 992612910 + ... + 992724730.

It is an arithmetic number, because the mean of its divisors is an integer number (1912307159700).

Almost surely, 2^{111001220121220} is an apocalyptic number.

111001220121220 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 111001220121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137686115498400).

111001220121220 is an abundant number, since it is smaller than the sum of its proper divisors (164371010875580).

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

111001220121220 is a wasteful number, since it uses less digits than its factorization.

111001220121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138566 (or 138551 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111001220121220 its reverse (22121022100111), we get a palindrome (133122242221331).

The spelling of 111001220121220 in words is "one hundred eleven trillion, one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty".