210066221 has 2 divisors, whose sum is σ = 210066222. Its totient is φ = 210066220.

The previous prime is 210066211. The next prime is 210066251. The reversal of 210066221 is 122660012.

It is a happy number.

210066221 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., 204890596 + 5175625 = 14314^2 + 2275^2 .

It is a cyclic number.

It is not a de Polignac number, because 210066221 - 2¹⁴ = 210049837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210066193 and 210066202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210066211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105033110 + 105033111.

It is an arithmetic number, because the mean of its divisors is an integer number (105033111).

Almost surely, 2^210066221 is an apocalyptic number.

It is an amenable number.

210066221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210066221 is an equidigital number, since it uses as much as digits as its factorization.

210066221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 210066221 is about 14493.6614076637. The cubic root of 210066221 is about 594.4546668778.

The spelling of 210066221 in words is "two hundred ten million, sixty-six thousand, two hundred twenty-one".