111111102020 has 12 divisors (see below), whose sum is σ = 233333314284. Its totient is φ = 44444440800.

The previous prime is 111111102013. The next prime is 111111102059. The reversal of 111111102020 is 20201111111.

It can be written as a sum of positive squares in 2 ways, for example, as 60819451456 + 50291650564 = 246616^2 + 224258^2 .

It is a junction number, because it is equal to n+sod(n) for n = 111111101992 and 111111102010.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777777531 + ... + 2777777570.

It is an arithmetic number, because the mean of its divisors is an integer number (19444442857).

Almost surely, 2^111111102020 is an apocalyptic number.

111111102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111102020 is an abundant number, since it is smaller than the sum of its proper divisors (122222212264).

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

111111102020 is a wasteful number, since it uses less digits than its factorization.

111111102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555555110 (or 5555555108 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111111102020 its reverse (20201111111), we get a palindrome (131312213131).

Subtracting from 111111102020 its reverse (20201111111), we obtain a palindrome (90909990909).

The spelling of 111111102020 in words is "one hundred eleven billion, one hundred eleven million, one hundred two thousand, twenty".