21200021201200 has 60 divisors (see below), whose sum is σ = 51458134029400. Its totient is φ = 8392585697280.

The previous prime is 21200021201159. The next prime is 21200021201231. The reversal of 21200021201200 is 210212000212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273157350 + ... + 273234949.

Almost surely, 2^{21200021201200} is an apocalyptic number.

21200021201200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200021201200 is an abundant number, since it is smaller than the sum of its proper divisors (30258112828200).

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

21200021201200 is a wasteful number, since it uses less digits than its factorization.

21200021201200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546392414 (or 546392403 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21200021201200 its reverse (210212000212), we get a palindrome (21410233201412).

The spelling of 21200021201200 in words is "twenty-one trillion, two hundred billion, twenty-one million, two hundred one thousand, two hundred".