111201020 has 48 divisors (see below), whose sum is σ = 273405888. Its totient is φ = 37194240.

The previous prime is 111201019. The next prime is 111201023. The reversal of 111201020 is 20102111.

It is a junction number, because it is equal to n+sod(n) for n = 111200989 and 111201007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111201023) 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, 3947 + ... + 15426.

It is an arithmetic number, because the mean of its divisors is an integer number (5695956).

Almost surely, 2^111201020 is an apocalyptic number.

111201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111201020 is an abundant number, since it is smaller than the sum of its proper divisors (162204868).

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

111201020 is a wasteful number, since it uses less digits than its factorization.

111201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19430 (or 19428 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 111201020 is about 10545.1894245670. The cubic root of 111201020 is about 480.8794928655.

Adding to 111201020 its reverse (20102111), we get a palindrome (131303131).

The spelling of 111201020 in words is "one hundred eleven million, two hundred one thousand, twenty".