211210020210221 has 2 divisors, whose sum is σ = 211210020210222. Its totient is φ = 211210020210220.

The previous prime is 211210020210199. The next prime is 211210020210223. The reversal of 211210020210221 is 122012020012112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122121528841321 + 89088491368900 = 11050861^2 + 9438670^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210020210221 - 2¹⁰ = 211210020209197 is a prime.

Together with 211210020210223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211210020210221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210020210223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605010105110 + 105605010105111.

It is an arithmetic number, because the mean of its divisors is an integer number (105605010105111).

Almost surely, 2^{211210020210221} is an apocalyptic number.

It is an amenable number.

211210020210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210020210221 is an equidigital number, since it uses as much as digits as its factorization.

211210020210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211210020210221 its reverse (122012020012112), we get a palindrome (333222040222333).

The spelling of 211210020210221 in words is "two hundred eleven trillion, two hundred ten billion, twenty million, two hundred ten thousand, two hundred twenty-one".