111111212020 has 24 divisors (see below), whose sum is σ = 234038494368. Its totient is φ = 44310208800.

The previous prime is 111111211921. The next prime is 111111212029. The reversal of 111111212020 is 20212111111.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111212029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8385466 + ... + 8398705.

It is an arithmetic number, because the mean of its divisors is an integer number (9751603932).

Almost surely, 2^111111212020 is an apocalyptic number.

111111212020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111212020 is an abundant number, since it is smaller than the sum of its proper divisors (122927282348).

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

111111212020 is a wasteful number, since it uses less digits than its factorization.

111111212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16784511 (or 16784509 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111111212020 its reverse (20212111111), we get a palindrome (131323323131).

The spelling of 111111212020 in words is "one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, twenty".