21002121000210 has 256 divisors, whose sum is σ = 59085127296000. Its totient is φ = 4775721172992.

The previous prime is 21002121000199. The next prime is 21002121000229. The reversal of 21002121000210 is 1200012120012.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3378173022 + ... + 3378179238.

It is an arithmetic number, because the mean of its divisors is an integer number (230801278500).

Almost surely, 2^{21002121000210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002121000210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29542563648000).

21002121000210 is an abundant number, since it is smaller than the sum of its proper divisors (38083006295790).

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

21002121000210 is a wasteful number, since it uses less digits than its factorization.

21002121000210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7890 (or 7876 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21002121000210 its reverse (1200012120012), we get a palindrome (22202133120222).

The spelling of 21002121000210 in words is "twenty-one trillion, two billion, one hundred twenty-one million, two hundred ten", and thus it is an aban number.