111121022110020 has 192 divisors, whose sum is σ = 340783747153920. Its totient is φ = 26888357371392.

The previous prime is 111121022110009. The next prime is 111121022110031. The reversal of 111121022110020 is 20011220121111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111121022110009) and next prime (111121022110031).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22813009 + ... + 27252071.

It is an arithmetic number, because the mean of its divisors is an integer number (1774915349760).

Almost surely, 2^{111121022110020} is an apocalyptic number.

111121022110020 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 111121022110020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170391873576960).

111121022110020 is an abundant number, since it is smaller than the sum of its proper divisors (229662725043900).

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

111121022110020 is a wasteful number, since it uses less digits than its factorization.

111121022110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439634 (or 4439632 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111121022110020 its reverse (20011220121111), we get a palindrome (131132242231131).

The spelling of 111121022110020 in words is "one hundred eleven trillion, one hundred twenty-one billion, twenty-two million, one hundred ten thousand, twenty".