21210220010000 has 400 divisors, whose sum is σ = 59048606897280. Its totient is φ = 7227548160000.

The previous prime is 21210220009999. The next prime is 21210220010041. The reversal of 21210220010000 is 1002201212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (400).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9185888846 + ... + 9185891154.

Almost surely, 2^{21210220010000} is an apocalyptic number.

21210220010000 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 21210220010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29524303448640).

21210220010000 is an abundant number, since it is smaller than the sum of its proper divisors (37838386887280).

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

21210220010000 is a wasteful number, since it uses less digits than its factorization.

21210220010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3092 (or 3071 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21210220010000 its reverse (1002201212), we get a palindrome (21211222211212).

The spelling of 21210220010000 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, ten thousand".