201221000100220 has 24 divisors (see below), whose sum is σ = 447420811988304. Its totient is φ = 75753788272896.

The previous prime is 201221000100199. The next prime is 201221000100247. The reversal of 201221000100220 is 22001000122102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 201221000100220.

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, 295913235102 + ... + 295913235781.

It is an arithmetic number, because the mean of its divisors is an integer number (18642533832846).

Almost surely, 2^{201221000100220} is an apocalyptic number.

201221000100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221000100220 is an abundant number, since it is smaller than the sum of its proper divisors (246199811888084).

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

201221000100220 is a wasteful number, since it uses less digits than its factorization.

201221000100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591826470909 (or 591826470907 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201221000100220 its reverse (22001000122102), we get a palindrome (223222000222322).

The spelling of 201221000100220 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred thousand, two hundred twenty".