111111012020 has 12 divisors (see below), whose sum is σ = 233333125284. Its totient is φ = 44444404800.

The previous prime is 111111012007. The next prime is 111111012029. The reversal of 111111012020 is 20210111111.

It can be written as a sum of positive squares in 2 ways, for example, as 83741941924 + 27369070096 = 289382^2 + 165436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 111111011992 and 111111012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111012029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777775281 + ... + 2777775320.

It is an arithmetic number, because the mean of its divisors is an integer number (19444427107).

Almost surely, 2^111111012020 is an apocalyptic number.

111111012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111012020 is an abundant number, since it is smaller than the sum of its proper divisors (122222113264).

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

111111012020 is a wasteful number, since it uses less digits than its factorization.

111111012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555550610 (or 5555550608 counting only the distinct ones).

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

Adding to 111111012020 its reverse (20210111111), we get a palindrome (131321123131).

Subtracting from 111111012020 its reverse (20210111111), we obtain a palindrome (90900900909).

The spelling of 111111012020 in words is "one hundred eleven billion, one hundred eleven million, twelve thousand, twenty".