22100001220 has 96 divisors (see below), whose sum is σ = 52061087232. Its totient is φ = 7810560000.

The previous prime is 22100001163. The next prime is 22100001251. The reversal of 22100001220 is 2210000122.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 22100001197 and 22100001206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2439900 + ... + 2448940.

It is an arithmetic number, because the mean of its divisors is an integer number (542302992).

Almost surely, 2^22100001220 is an apocalyptic number.

22100001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22100001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26030543616).

22100001220 is an abundant number, since it is smaller than the sum of its proper divisors (29961086012).

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

22100001220 is a wasteful number, since it uses less digits than its factorization.

22100001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9373 (or 9371 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

22100001220 divided by its sum of digits (10) gives a palindrome (2210000122).

Adding to 22100001220 its reverse (2210000122), we get a palindrome (24310001342).

The spelling of 22100001220 in words is "twenty-two billion, one hundred million, one thousand, two hundred twenty".