21102000220020 has 24 divisors (see below), whose sum is σ = 59085600616224. Its totient is φ = 5627200058656.

The previous prime is 21102000220003. The next prime is 21102000220043. The reversal of 21102000220020 is 2002200020112.

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 = 21102000219978 and 21102000220005.

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, 175850001774 + ... + 175850001893.

It is an arithmetic number, because the mean of its divisors is an integer number (2461900025676).

Almost surely, 2^{21102000220020} is an apocalyptic number.

21102000220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102000220020 is an abundant number, since it is smaller than the sum of its proper divisors (37983600396204).

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

21102000220020 is a wasteful number, since it uses less digits than its factorization.

21102000220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351700003679 (or 351700003677 counting only the distinct ones).

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

Adding to 21102000220020 its reverse (2002200020112), we get a palindrome (23104200240132).

The spelling of 21102000220020 in words is "twenty-one trillion, one hundred two billion, two hundred twenty thousand, twenty".