21002200000 has 168 divisors, whose sum is σ = 52479391104. Its totient is φ = 8338560000.

The previous prime is 21002199989. The next prime is 21002200097. The reversal of 21002200000 is 220012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34599697 + ... + 34600303.

It is an arithmetic number, because the mean of its divisors is an integer number (312377328).

Almost surely, 2^21002200000 is an apocalyptic number.

21002200000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26239695552).

21002200000 is an abundant number, since it is smaller than the sum of its proper divisors (31477191104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002200000 is an frugal number, since it uses more digits than its factorization.

21002200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 21002200000 its reverse (220012), we get a palindrome (21002420012).

The spelling of 21002200000 in words is "twenty-one billion, two million, two hundred thousand".