21220002200121 has 64 divisors (see below), whose sum is σ = 29966548147200. Its totient is φ = 13319610796800.

The previous prime is 21220002200099. The next prime is 21220002200141. The reversal of 21220002200121 is 12100220002212.

It is not a de Polignac number, because 21220002200121 - 2⁹ = 21220002199609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220002200121.

It is not an unprimeable number, because it can be changed into a prime (21220002200141) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 11874650590 + ... + 11874652376.

It is an arithmetic number, because the mean of its divisors is an integer number (468227314800).

Almost surely, 2^{21220002200121} is an apocalyptic number.

It is an amenable number.

21220002200121 is a deficient number, since it is larger than the sum of its proper divisors (8746545947079).

21220002200121 is a wasteful number, since it uses less digits than its factorization.

21220002200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830.

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

Adding to 21220002200121 its reverse (12100220002212), we get a palindrome (33320222202333).

The spelling of 21220002200121 in words is "twenty-one trillion, two hundred twenty billion, two million, two hundred thousand, one hundred twenty-one".