210018110221 has 2 divisors, whose sum is σ = 210018110222. Its totient is φ = 210018110220.

The previous prime is 210018110213. The next prime is 210018110243. The reversal of 210018110221 is 122011810012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124125154596 + 85892955625 = 352314^2 + 293075^2 .

It is a cyclic number.

It is not a de Polignac number, because 210018110221 - 2³ = 210018110213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210018110201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105009055110 + 105009055111.

It is an arithmetic number, because the mean of its divisors is an integer number (105009055111).

Almost surely, 2^210018110221 is an apocalyptic number.

It is an amenable number.

210018110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210018110221 is an equidigital number, since it uses as much as digits as its factorization.

210018110221 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 19.

Adding to 210018110221 its reverse (122011810012), we get a palindrome (332029920233).

The spelling of 210018110221 in words is "two hundred ten billion, eighteen million, one hundred ten thousand, two hundred twenty-one".