21200021201100 has 216 divisors, whose sum is σ = 71874047422800. Its totient is φ = 4810348462080.

The previous prime is 21200021201081. The next prime is 21200021201137. The reversal of 21200021201100 is 110212000212.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3249525 + ... + 7277324.

It is an arithmetic number, because the mean of its divisors is an integer number (332750219550).

Almost surely, 2^{21200021201100} is an apocalyptic number.

21200021201100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200021201100 is an abundant number, since it is smaller than the sum of its proper divisors (50674026221700).

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

21200021201100 is a wasteful number, since it uses less digits than its factorization.

21200021201100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10527017 (or 10527003 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200021201100 its reverse (110212000212), we get a palindrome (21310233201312).

The spelling of 21200021201100 in words is "twenty-one trillion, two hundred billion, twenty-one million, two hundred one thousand, one hundred".