111100122122100 has 576 divisors, whose sum is σ = 355537544140800. Its totient is φ = 26669738557440.

The previous prime is 111100122122021. The next prime is 111100122122111. The reversal of 111100122122100 is 1221221001111.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 111100122122100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2905394781 + ... + 2905433019.

It is an arithmetic number, because the mean of its divisors is an integer number (617252680800).

Almost surely, 2^{111100122122100} is an apocalyptic number.

111100122122100 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 111100122122100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177768772070400).

111100122122100 is an abundant number, since it is smaller than the sum of its proper divisors (244437422018700).

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

111100122122100 is a wasteful number, since it uses less digits than its factorization.

111100122122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38572 (or 38565 counting only the distinct ones).

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

Adding to 111100122122100 its reverse (1221221001111), we get a palindrome (112321343123211).

The spelling of 111100122122100 in words is "one hundred eleven trillion, one hundred billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred".