111221222112020 has 24 divisors (see below), whose sum is σ = 233871484425768. Its totient is φ = 44430028275200.

The previous prime is 111221222111869. The next prime is 111221222112059. The reversal of 111221222112020 is 20211222122111.

It can be written as a sum of positive squares in 4 ways, for example, as 3043999026436 + 108177223085584 = 1744706^2 + 10400828^2 .

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 = 111221222111983 and 111221222112001.

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, 3653770001 + ... + 3653800440.

It is an arithmetic number, because the mean of its divisors is an integer number (9744645184407).

Almost surely, 2^{111221222112020} is an apocalyptic number.

111221222112020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221222112020 is an abundant number, since it is smaller than the sum of its proper divisors (122650262313748).

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

111221222112020 is a wasteful number, since it uses less digits than its factorization.

111221222112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7307571211 (or 7307571209 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111221222112020 its reverse (20211222122111), we get a palindrome (131432444234131).

The spelling of 111221222112020 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, twenty".