21200010202221 has 16 divisors (see below), whose sum is σ = 28401906757440. Its totient is φ = 14065876978560.

The previous prime is 21200010202181. The next prime is 21200010202229. The reversal of 21200010202221 is 12220201000212.

It is not a de Polignac number, because 21200010202221 - 2⁶ = 21200010202157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21200010202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200010202229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 18195490 + ... + 19325523.

It is an arithmetic number, because the mean of its divisors is an integer number (1775119172340).

Almost surely, 2^{21200010202221} is an apocalyptic number.

It is an amenable number.

21200010202221 is a deficient number, since it is larger than the sum of its proper divisors (7201896555219).

21200010202221 is a wasteful number, since it uses less digits than its factorization.

21200010202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37521916.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21200010202221 its reverse (12220201000212), we get a palindrome (33420211202433).

The spelling of 21200010202221 in words is "twenty-one trillion, two hundred billion, ten million, two hundred two thousand, two hundred twenty-one".