210012200021 has 16 divisors (see below), whose sum is σ = 231706962480. Its totient is φ = 189109831680.

The previous prime is 210012200003. The next prime is 210012200033. The reversal of 210012200021 is 120002210012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 147068415025 + 62943784996 = 383495^2 + 250886^2 .

It is a cyclic number.

It is not a de Polignac number, because 210012200021 - 2²⁶ = 209945091157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210012199975 and 210012200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210012200051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8853545 + ... + 8877233.

It is an arithmetic number, because the mean of its divisors is an integer number (14481685155).

Almost surely, 2^210012200021 is an apocalyptic number.

It is an amenable number.

210012200021 is a deficient number, since it is larger than the sum of its proper divisors (21694762459).

210012200021 is a wasteful number, since it uses less digits than its factorization.

210012200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40376.

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

Adding to 210012200021 its reverse (120002210012), we get a palindrome (330014410033).

Subtracting from 210012200021 its reverse (120002210012), we obtain a palindrome (90009990009).

The spelling of 210012200021 in words is "two hundred ten billion, twelve million, two hundred thousand, twenty-one".