201221102020 has 12 divisors (see below), whose sum is σ = 422564314284. Its totient is φ = 80488440800.

The previous prime is 201221102009. The next prime is 201221102053. The reversal of 201221102020 is 20201122102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 60572100996 + 140649001024 = 246114^2 + 375032^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5030527531 + ... + 5030527570.

It is an arithmetic number, because the mean of its divisors is an integer number (35213692857).

Almost surely, 2^201221102020 is an apocalyptic number.

201221102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221102020 is an abundant number, since it is smaller than the sum of its proper divisors (221343212264).

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

201221102020 is a wasteful number, since it uses less digits than its factorization.

201221102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10061055110 (or 10061055108 counting only the distinct ones).

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

Adding to 201221102020 its reverse (20201122102), we get a palindrome (221422224122).

The spelling of 201221102020 in words is "two hundred one billion, two hundred twenty-one million, one hundred two thousand, twenty".