111521222120 has 128 divisors (see below), whose sum is σ = 319495311360. Its totient is φ = 34020245760.

The previous prime is 111521222119. The next prime is 111521222123. The reversal of 111521222120 is 21222125111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111521222092 and 111521222101.

It is not an unprimeable number, because it can be changed into a prime (111521222123) 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 31 ways as a sum of consecutive naturals, for example, 240434 + ... + 529953.

It is an arithmetic number, because the mean of its divisors is an integer number (2496057120).

Almost surely, 2^111521222120 is an apocalyptic number.

111521222120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111521222120 is an abundant number, since it is smaller than the sum of its proper divisors (207974089240).

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

111521222120 is a wasteful number, since it uses less digits than its factorization.

111521222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770463 (or 770459 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 111521222120 its reverse (21222125111), we get a palindrome (132743347231).

The spelling of 111521222120 in words is "one hundred eleven billion, five hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty".