20002201221220 has 12 divisors (see below), whose sum is σ = 42004622564604. Its totient is φ = 8000880488480.

The previous prime is 20002201221217. The next prime is 20002201221221. The reversal of 20002201221220 is 2212210220002.

It can be written as a sum of positive squares in 2 ways, for example, as 13745289311296 + 6256911909924 = 3707464^2 + 2501382^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20002201221194 and 20002201221203.

It is not an unprimeable number, because it can be changed into a prime (20002201221221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500055030511 + ... + 500055030550.

It is an arithmetic number, because the mean of its divisors is an integer number (3500385213717).

Almost surely, 2^{20002201221220} is an apocalyptic number.

20002201221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002201221220 is an abundant number, since it is smaller than the sum of its proper divisors (22002421343384).

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

20002201221220 is a wasteful number, since it uses less digits than its factorization.

20002201221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000110061070 (or 1000110061068 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20002201221220 its reverse (2212210220002), we get a palindrome (22214411441222).

The spelling of 20002201221220 in words is "twenty trillion, two billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty".