210221200020 has 96 divisors (see below), whose sum is σ = 640174227840. Its totient is φ = 51234393600.

The previous prime is 210221200003. The next prime is 210221200039. The reversal of 210221200020 is 20002122012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 210221199969 and 210221200005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1255450 + ... + 1413009.

It is an arithmetic number, because the mean of its divisors is an integer number (6668481540).

Almost surely, 2^210221200020 is an apocalyptic number.

210221200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221200020 is an abundant number, since it is smaller than the sum of its proper divisors (429953027820).

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

210221200020 is a wasteful number, since it uses less digits than its factorization.

210221200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668585 (or 2668583 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 210221200020 its reverse (20002122012), we get a palindrome (230223322032).

The spelling of 210221200020 in words is "two hundred ten billion, two hundred twenty-one million, two hundred thousand, twenty".