210221112221 has 2 divisors, whose sum is σ = 210221112222. Its totient is φ = 210221112220.

The previous prime is 210221112203. The next prime is 210221112253. The reversal of 210221112221 is 122211122012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189372928900 + 20848183321 = 435170^2 + 144389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210221112221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210221112221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210221192221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110556110 + 105110556111.

It is an arithmetic number, because the mean of its divisors is an integer number (105110556111).

Almost surely, 2^210221112221 is an apocalyptic number.

It is an amenable number.

210221112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221112221 is an equidigital number, since it uses as much as digits as its factorization.

210221112221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 210221112221 its reverse (122211122012), we get a palindrome (332432234233).

The spelling of 210221112221 in words is "two hundred ten billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".