111223201020 has 96 divisors (see below), whose sum is σ = 320100475968. Its totient is φ = 28834578432.

The previous prime is 111223201007. The next prime is 111223201049. The reversal of 111223201020 is 20102322111.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2815324 + ... + 2854556.

It is an arithmetic number, because the mean of its divisors is an integer number (3334379958).

Almost surely, 2^111223201020 is an apocalyptic number.

111223201020 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 111223201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160050237984).

111223201020 is an abundant number, since it is smaller than the sum of its proper divisors (208877274948).

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

111223201020 is a wasteful number, since it uses less digits than its factorization.

111223201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40559 (or 40557 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 111223201020 its reverse (20102322111), we get a palindrome (131325523131).

The spelling of 111223201020 in words is "one hundred eleven billion, two hundred twenty-three million, two hundred one thousand, twenty".