111001220020 has 48 divisors (see below), whose sum is σ = 234928512000. Its totient is φ = 44053892480.

The previous prime is 111001219997. The next prime is 111001220021. The reversal of 111001220020 is 20022100111.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 111001219979 and 111001220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001220021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1448631 + ... + 1523329.

It is an arithmetic number, because the mean of its divisors is an integer number (4894344000).

Almost surely, 2^111001220020 is an apocalyptic number.

111001220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111001220020 is an abundant number, since it is smaller than the sum of its proper divisors (123927291980).

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

111001220020 is a wasteful number, since it uses less digits than its factorization.

111001220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75288 (or 75286 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 111001220020 its reverse (20022100111), we get a palindrome (131023320131).

The spelling of 111001220020 in words is "one hundred eleven billion, one million, two hundred twenty thousand, twenty".