21201200200020 has 48 divisors (see below), whose sum is σ = 59367392860608. Its totient is φ = 5653269358080.

The previous prime is 21201200200003. The next prime is 21201200200039. The reversal of 21201200200020 is 2000200210212.

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 = 21201200199969 and 21201200200005.

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 15 ways as a sum of consecutive naturals, for example, 11109669 + ... + 12877388.

It is an arithmetic number, because the mean of its divisors is an integer number (1236820684596).

Almost surely, 2^{21201200200020} is an apocalyptic number.

21201200200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201200200020 is an abundant number, since it is smaller than the sum of its proper divisors (38166192660588).

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

21201200200020 is a wasteful number, since it uses less digits than its factorization.

21201200200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24001800 (or 24001798 counting only the distinct ones).

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

Adding to 21201200200020 its reverse (2000200210212), we get a palindrome (23201400410232).

The spelling of 21201200200020 in words is "twenty-one trillion, two hundred one billion, two hundred million, two hundred thousand, twenty".