111111102100020 has 96 divisors (see below), whose sum is σ = 348566720374656. Its totient is φ = 26208024076800.

The previous prime is 111111102099979. The next prime is 111111102100027. The reversal of 111111102100020 is 20001201111111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 111111102099969 and 111111102100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111102100027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2274977671 + ... + 2275026510.

It is an arithmetic number, because the mean of its divisors is an integer number (3630903337236).

Almost surely, 2^{111111102100020} is an apocalyptic number.

111111102100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111102100020 is an abundant number, since it is smaller than the sum of its proper divisors (237455618274636).

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

111111102100020 is a wasteful number, since it uses less digits than its factorization.

111111102100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4550004241 (or 4550004239 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 111111102100020 its reverse (20001201111111), we get a palindrome (131112303211131).

The spelling of 111111102100020 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred two million, one hundred thousand, twenty".