111221222222020 has 96 divisors (see below), whose sum is σ = 246752485509600. Its totient is φ = 42051254784000.

The previous prime is 111221222221999. The next prime is 111221222222051. The reversal of 111221222222020 is 20222222122111.

It can be written as a sum of positive squares in 16 ways, for example, as 87753397824 + 111133468824196 = 296232^2 + 10541986^2 .

It is a junction number, because it is equal to n+sod(n) for n = 111221222221982 and 111221222222000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5452791 + ... + 15880030.

It is an arithmetic number, because the mean of its divisors is an integer number (2570338390725).

Almost surely, 2^{111221222222020} is an apocalyptic number.

111221222222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221222222020 is an abundant number, since it is smaller than the sum of its proper divisors (135531263287580).

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

111221222222020 is a wasteful number, since it uses less digits than its factorization.

111221222222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21333049 (or 21333047 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 111221222222020 its reverse (20222222122111), we get a palindrome (131443444344131).

Subtracting from 111221222222020 its reverse (20222222122111), we obtain a palindrome (90999000099909).

The spelling of 111221222222020 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty".