111212111020 has 48 divisors (see below), whose sum is σ = 242144652960. Its totient is φ = 42853830656.

The previous prime is 111212110993. The next prime is 111212111029. The reversal of 111212111020 is 20111212111.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (111212111029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40524 + ... + 473356.

It is an arithmetic number, because the mean of its divisors is an integer number (5044680270).

Almost surely, 2^111212111020 is an apocalyptic number.

111212111020 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 111212111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121072326480).

111212111020 is an abundant number, since it is smaller than the sum of its proper divisors (130932541940).

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

111212111020 is a wasteful number, since it uses less digits than its factorization.

111212111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433314 (or 433312 counting only the distinct ones).

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

Adding to 111212111020 its reverse (20111212111), we get a palindrome (131323323131).

The spelling of 111212111020 in words is "one hundred eleven billion, two hundred twelve million, one hundred eleven thousand, twenty".