201221222020 has 96 divisors (see below), whose sum is σ = 521322681600. Its totient is φ = 63530970624.

The previous prime is 201221221997. The next prime is 201221222039. The reversal of 201221222020 is 20222122102.

201221222020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 201221221985 and 201221222003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 630646 + ... + 894514.

It is an arithmetic number, because the mean of its divisors is an integer number (5430444600).

Almost surely, 2^201221222020 is an apocalyptic number.

201221222020 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 201221222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260661340800).

201221222020 is an abundant number, since it is smaller than the sum of its proper divisors (320101459580).

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

201221222020 is a wasteful number, since it uses less digits than its factorization.

201221222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264317 (or 264315 counting only the distinct ones).

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

Adding to 201221222020 its reverse (20222122102), we get a palindrome (221443344122).

The spelling of 201221222020 in words is "two hundred one billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty".