21210100000002 has 96 divisors (see below), whose sum is σ = 47893996358208. Its totient is φ = 6777845797248.

The previous prime is 21210099999971. The next prime is 21210100000093. The reversal of 21210100000002 is 20000000101212.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a self number, because there is not a number n which added to its sum of digits gives 21210100000002.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20104353 + ... + 21133035.

It is an arithmetic number, because the mean of its divisors is an integer number (498895795398).

Almost surely, 2^{21210100000002} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210100000002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23946998179104).

21210100000002 is an abundant number, since it is smaller than the sum of its proper divisors (26683896358206).

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

21210100000002 is a wasteful number, since it uses less digits than its factorization.

21210100000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029184 (or 1029181 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21210100000002 its reverse (20000000101212), we get a palindrome (41210100101214).

The spelling of 21210100000002 in words is "twenty-one trillion, two hundred ten billion, one hundred million, two", and thus it is an aban number.