210221202020020 has 48 divisors (see below), whose sum is σ = 475518589959168. Its totient is φ = 77837864417280.

The previous prime is 210221202019993. The next prime is 210221202020041. The reversal of 210221202020020 is 20020202122012.

It is a junction number, because it is equal to n+sod(n) for n = 210221202019976 and 210221202020003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7370995629 + ... + 7371024148.

It is an arithmetic number, because the mean of its divisors is an integer number (9906637290816).

Almost surely, 2^{210221202020020} is an apocalyptic number.

210221202020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221202020020 is an abundant number, since it is smaller than the sum of its proper divisors (265297387939148).

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

210221202020020 is a wasteful number, since it uses less digits than its factorization.

210221202020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14742019840 (or 14742019838 counting only the distinct ones).

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

Adding to 210221202020020 its reverse (20020202122012), we get a palindrome (230241404142032).

The spelling of 210221202020020 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred two million, twenty thousand, twenty".