210224221 has 2 divisors, whose sum is σ = 210224222. Its totient is φ = 210224220.

The previous prime is 210224191. The next prime is 210224263. The reversal of 210224221 is 122422012.

210224221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137804121 + 72420100 = 11739^2 + 8510^2 .

It is a cyclic number.

It is not a de Polignac number, because 210224221 - 2⁷ = 210224093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210224195 and 210224204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210224821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105112110 + 105112111.

It is an arithmetic number, because the mean of its divisors is an integer number (105112111).

Almost surely, 2^210224221 is an apocalyptic number.

It is an amenable number.

210224221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210224221 is an equidigital number, since it uses as much as digits as its factorization.

210224221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 210224221 is about 14499.1110417156. Note that the first 3 decimals coincide. The cubic root of 210224221 is about 594.6036679859.

Adding to 210224221 its reverse (122422012), we get a palindrome (332646233).

The spelling of 210224221 in words is "two hundred ten million, two hundred twenty-four thousand, two hundred twenty-one".