111002100120 has 192 divisors, whose sum is σ = 371409948000. Its totient is φ = 28730363904.

The previous prime is 111002100073. The next prime is 111002100149. The reversal of 111002100120 is 21001200111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5571136 + ... + 5591024.

Almost surely, 2^111002100120 is an apocalyptic number.

111002100120 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 111002100120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185704974000).

111002100120 is an abundant number, since it is smaller than the sum of its proper divisors (260407847880).

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

111002100120 is a wasteful number, since it uses less digits than its factorization.

111002100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20362 (or 20355 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111002100120 its reverse (21001200111), we get a palindrome (132003300231).

Subtracting from 111002100120 its reverse (21001200111), we obtain a palindrome (90000900009).

The spelling of 111002100120 in words is "one hundred eleven billion, two million, one hundred thousand, one hundred twenty".