212021000210221 has 4 divisors (see below), whose sum is σ = 212021102868444. Its totient is φ = 212020897552000.

The previous prime is 212021000210219. The next prime is 212021000210303. The reversal of 212021000210221 is 122012000120212.

It is a happy number.

212021000210221 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 17212292512900 + 194808707697321 = 4148770^2 + 13957389^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021000210221 - 2¹ = 212021000210219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021000210195 and 212021000210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021000250221) 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, 48166180 + ... + 52383421.

It is an arithmetic number, because the mean of its divisors is an integer number (53005275717111).

Almost surely, 2^{212021000210221} is an apocalyptic number.

It is an amenable number.

212021000210221 is a deficient number, since it is larger than the sum of its proper divisors (102658223).

212021000210221 is a wasteful number, since it uses less digits than its factorization.

212021000210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102658222.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212021000210221 its reverse (122012000120212), we get a palindrome (334033000330433).

Subtracting from 212021000210221 its reverse (122012000120212), we obtain a palindrome (90009000090009).

The spelling of 212021000210221 in words is "two hundred twelve trillion, twenty-one billion, two hundred ten thousand, two hundred twenty-one".