111321123020 has 48 divisors (see below), whose sum is σ = 234755895360. Its totient is φ = 44341779456.

The previous prime is 111321122921. The next prime is 111321123029. The reversal of 111321123020 is 20321123111.

It is a self number, because there is not a number n which added to its sum of digits gives 111321123020.

It is not an unprimeable number, because it can be changed into a prime (111321123029) 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, 6646016 + ... + 6662744.

It is an arithmetic number, because the mean of its divisors is an integer number (4890747820).

Almost surely, 2^111321123020 is an apocalyptic number.

111321123020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111321123020 is an abundant number, since it is smaller than the sum of its proper divisors (123434772340).

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

111321123020 is a wasteful number, since it uses less digits than its factorization.

111321123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18114 (or 18112 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 111321123020 its reverse (20321123111), we get a palindrome (131642246131).

Subtracting from 111321123020 its reverse (20321123111), we obtain a palindrome (90999999909).

The spelling of 111321123020 in words is "one hundred eleven billion, three hundred twenty-one million, one hundred twenty-three thousand, twenty".