201221202020 has 24 divisors (see below), whose sum is σ = 444804763200. Its totient is φ = 76252244832.

The previous prime is 201221201983. The next prime is 201221202043. The reversal of 201221202020 is 20202122102.

It is a junction number, because it is equal to n+sod(n) for n = 201221201986 and 201221202004.

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, 264764360 + ... + 264765119.

It is an arithmetic number, because the mean of its divisors is an integer number (18533531800).

Almost surely, 2^201221202020 is an apocalyptic number.

201221202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221202020 is an abundant number, since it is smaller than the sum of its proper divisors (243583561180).

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

201221202020 is a wasteful number, since it uses less digits than its factorization.

201221202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529529507 (or 529529505 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 201221202020 its reverse (20202122102), we get a palindrome (221423324122).

The spelling of 201221202020 in words is "two hundred one billion, two hundred twenty-one million, two hundred two thousand, twenty".