21002200000221 has 16 divisors (see below), whose sum is σ = 31374293859648. Its totient is φ = 12384589680000.

The previous prime is 21002200000181. The next prime is 21002200000237. The reversal of 21002200000221 is 12200000220012.

It is not a de Polignac number, because 21002200000221 - 2¹¹ = 21002199998173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002200000197 and 21002200000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002200000261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8600408280 + ... + 8600410721.

It is an arithmetic number, because the mean of its divisors is an integer number (1960893366228).

Almost surely, 2^{21002200000221} is an apocalyptic number.

It is an amenable number.

21002200000221 is a deficient number, since it is larger than the sum of its proper divisors (10372093859427).

21002200000221 is a wasteful number, since it uses less digits than its factorization.

21002200000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17200819052.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21002200000221 its reverse (12200000220012), we get a palindrome (33202200220233).

The spelling of 21002200000221 in words is "twenty-one trillion, two billion, two hundred million, two hundred twenty-one", and thus it is an aban number.