111221121020 has 24 divisors (see below), whose sum is σ = 233909381664. Its totient is φ = 44422728896.

The previous prime is 111221121017. The next prime is 111221121041. The reversal of 111221121020 is 20121122111.

It is a junction number, because it is equal to n+sod(n) for n = 111221120986 and 111221121004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4093592 + ... + 4120671.

It is an arithmetic number, because the mean of its divisors is an integer number (9746224236).

Almost surely, 2^111221121020 is an apocalyptic number.

111221121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221121020 is an abundant number, since it is smaller than the sum of its proper divisors (122688260644).

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

111221121020 is a wasteful number, since it uses less digits than its factorization.

111221121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8214949 (or 8214947 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111221121020 its reverse (20121122111), we get a palindrome (131342243131).

The spelling of 111221121020 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty".