21210001010000 has 200 divisors, whose sum is σ = 56574536328288. Its totient is φ = 7636360000000.

The previous prime is 21210001009991. The next prime is 21210001010047. The reversal of 21210001010000 is 1010001212.

21210001010000 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21210001010000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10155455 + ... + 12064545.

Almost surely, 2^{21210001010000} is an apocalyptic number.

21210001010000 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 21210001010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28287268164144).

21210001010000 is an abundant number, since it is smaller than the sum of its proper divisors (35364535318288).

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

21210001010000 is a wasteful number, since it uses less digits than its factorization.

21210001010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909231 (or 1909210 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21210001010000 its reverse (1010001212), we get a palindrome (21211011011212).

The spelling of 21210001010000 in words is "twenty-one trillion, two hundred ten billion, one million, ten thousand".