21012002020200 has 96 divisors (see below), whose sum is σ = 67383316879200. Its totient is φ = 5409986722560.

The previous prime is 21012002020187. The next prime is 21012002020201. The reversal of 21012002020200 is 202020021012.

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

It is not an unprimeable number, because it can be changed into a prime (21012002020201) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 603775762 + ... + 603810561.

It is an arithmetic number, because the mean of its divisors is an integer number (701909550825).

Almost surely, 2^{21012002020200} is an apocalyptic number.

21012002020200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012002020200 is an abundant number, since it is smaller than the sum of its proper divisors (46371314859000).

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

21012002020200 is a wasteful number, since it uses less digits than its factorization.

21012002020200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207586371 (or 1207586362 counting only the distinct ones).

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

Adding to 21012002020200 its reverse (202020021012), we get a palindrome (21214022041212).

The spelling of 21012002020200 in words is "twenty-one trillion, twelve billion, two million, twenty thousand, two hundred".