21200111200221 has 64 divisors (see below), whose sum is σ = 31192412843520. Its totient is φ = 12764537533440.

The previous prime is 21200111200211. The next prime is 21200111200259. The reversal of 21200111200221 is 12200211100212.

It is not a de Polignac number, because 21200111200221 - 2¹⁷ = 21200111069149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21200111200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200111200211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20614575 + ... + 21618531.

It is an arithmetic number, because the mean of its divisors is an integer number (487381450680).

Almost surely, 2^{21200111200221} is an apocalyptic number.

It is an amenable number.

21200111200221 is a deficient number, since it is larger than the sum of its proper divisors (9992301643299).

21200111200221 is a wasteful number, since it uses less digits than its factorization.

21200111200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004246.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200111200221 its reverse (12200211100212), we get a palindrome (33400322300433).

The spelling of 21200111200221 in words is "twenty-one trillion, two hundred billion, one hundred eleven million, two hundred thousand, two hundred twenty-one".