111011201020 has 48 divisors (see below), whose sum is σ = 239290692480. Its totient is φ = 43243851584.

The previous prime is 111011200997. The next prime is 111011201027. The reversal of 111011201020 is 20102110111.

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 = 111011200988 and 111011201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111011201027) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 313354 + ... + 565873.

It is an arithmetic number, because the mean of its divisors is an integer number (4985222760).

Almost surely, 2^111011201020 is an apocalyptic number.

111011201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111011201020 is an abundant number, since it is smaller than the sum of its proper divisors (128279491460).

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

111011201020 is a wasteful number, since it uses less digits than its factorization.

111011201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879402 (or 879400 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 111011201020 its reverse (20102110111), we get a palindrome (131113311131).

Subtracting from 111011201020 its reverse (20102110111), we obtain a palindrome (90909090909).

It can be divided in two parts, 11101 and 1201020, that added together give a palindrome (1212121).

The spelling of 111011201020 in words is "one hundred eleven billion, eleven million, two hundred one thousand, twenty".