21331300220020 has 96 divisors (see below), whose sum is σ = 53895015014400. Its totient is φ = 6927966785664.

The previous prime is 21331300220017. The next prime is 21331300220051. The reversal of 21331300220020 is 2002200313312.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21331300220020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26412319 + ... + 27207961.

It is an arithmetic number, because the mean of its divisors is an integer number (561406406400).

Almost surely, 2^{21331300220020} is an apocalyptic number.

21331300220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331300220020 is an abundant number, since it is smaller than the sum of its proper divisors (32563714794380).

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

21331300220020 is a wasteful number, since it uses less digits than its factorization.

21331300220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805757 (or 805755 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21331300220020 its reverse (2002200313312), we get a palindrome (23333500533332).

The spelling of 21331300220020 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred million, two hundred twenty thousand, twenty".