21200200022221 has 8 divisors (see below), whose sum is σ = 23130575100000. Its totient is φ = 19270338972240.

The previous prime is 21200200022207. The next prime is 21200200022237. The reversal of 21200200022221 is 12222000200212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21200200022221 - 2⁵ = 21200200022189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200200022195 and 21200200022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200200022251) 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 7 ways as a sum of consecutive naturals, for example, 128420706 + ... + 128585683.

It is an arithmetic number, because the mean of its divisors is an integer number (2891321887500).

Almost surely, 2^{21200200022221} is an apocalyptic number.

It is an amenable number.

21200200022221 is a deficient number, since it is larger than the sum of its proper divisors (1930375077779).

21200200022221 is a wasteful number, since it uses less digits than its factorization.

21200200022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257013899.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21200200022221 its reverse (12222000200212), we get a palindrome (33422200222433).

The spelling of 21200200022221 in words is "twenty-one trillion, two hundred billion, two hundred million, twenty-two thousand, two hundred twenty-one".