22221220111220 has 96 divisors (see below), whose sum is σ = 52089403580928. Its totient is φ = 7910335014912.

The previous prime is 22221220111201. The next prime is 22221220111273. The reversal of 22221220111220 is 2211102212222.

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 = 22221220111192 and 22221220111201.

It is a congruent number.

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, 12751637 + ... + 14389116.

It is an arithmetic number, because the mean of its divisors is an integer number (542597953968).

Almost surely, 2^{22221220111220} is an apocalyptic number.

22221220111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221220111220 is an abundant number, since it is smaller than the sum of its proper divisors (29868183469708).

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

22221220111220 is a wasteful number, since it uses less digits than its factorization.

22221220111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27140889 (or 27140887 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22221220111220 its reverse (2211102212222), we get a palindrome (24432322323442).

The spelling of 22221220111220 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, two hundred twenty".