111222121020 has 48 divisors (see below), whose sum is σ = 312662706048. Its totient is φ = 29541064000.

The previous prime is 111222121013. The next prime is 111222121081. The reversal of 111222121020 is 20121222111.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3677574 + ... + 3707693.

It is an arithmetic number, because the mean of its divisors is an integer number (6513806376).

Almost surely, 2^111222121020 is an apocalyptic number.

111222121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111222121020 is an abundant number, since it is smaller than the sum of its proper divisors (201440585028).

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

111222121020 is a wasteful number, since it uses less digits than its factorization.

111222121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7385530 (or 7385528 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 111222121020 its reverse (20121222111), we get a palindrome (131343343131).

The spelling of 111222121020 in words is "one hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty".