210012021200021 has 4 divisors (see below), whose sum is σ = 210018459172044. Its totient is φ = 210005583228000.

The previous prime is 210012021199997. The next prime is 210012021200041. The reversal of 210012021200021 is 120002120210012.

210012021200021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77945060822500 + 132066960377521 = 8828650^2 + 11492039^2 .

It is a cyclic number.

It is not a de Polignac number, because 210012021200021 - 2³⁴ = 209994841330837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210012021199969 and 210012021200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210012021200041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3218937080 + ... + 3219002321.

It is an arithmetic number, because the mean of its divisors is an integer number (52504614793011).

Almost surely, 2^{210012021200021} is an apocalyptic number.

It is an amenable number.

210012021200021 is a deficient number, since it is larger than the sum of its proper divisors (6437972023).

210012021200021 is an equidigital number, since it uses as much as digits as its factorization.

210012021200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6437972022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210012021200021 its reverse (120002120210012), we get a palindrome (330014141410033).

Subtracting from 210012021200021 its reverse (120002120210012), we obtain a palindrome (90009900990009).

The spelling of 210012021200021 in words is "two hundred ten trillion, twelve billion, twenty-one million, two hundred thousand, twenty-one".