21001202100200 has 48 divisors (see below), whose sum is σ = 55803194155680. Its totient is φ = 7200412148160.

The previous prime is 21001202100143. The next prime is 21001202100211. The reversal of 21001202100200 is 200120210012.

It is a happy number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7500427922 + ... + 7500430721.

It is an arithmetic number, because the mean of its divisors is an integer number (1162566544910).

Almost surely, 2^{21001202100200} is an apocalyptic number.

21001202100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001202100200 is an abundant number, since it is smaller than the sum of its proper divisors (34801992055480).

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

21001202100200 is a wasteful number, since it uses less digits than its factorization.

21001202100200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15000858666 (or 15000858657 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21001202100200 its reverse (200120210012), we get a palindrome (21201322310212).

The spelling of 21001202100200 in words is "twenty-one trillion, one billion, two hundred two million, one hundred thousand, two hundred".