210730217 has 2 divisors, whose sum is σ = 210730218. Its totient is φ = 210730216.

The previous prime is 210730213. The next prime is 210730231. The reversal of 210730217 is 712037012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159163456 + 51566761 = 12616^2 + 7181^2 .

It is a cyclic number.

It is not a de Polignac number, because 210730217 - 2² = 210730213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210730192 and 210730201.

It is not a weakly prime, because it can be changed into another prime (210730213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105365108 + 105365109.

It is an arithmetic number, because the mean of its divisors is an integer number (105365109).

Almost surely, 2^210730217 is an apocalyptic number.

It is an amenable number.

210730217 is a deficient number, since it is larger than the sum of its proper divisors (1).

210730217 is an equidigital number, since it uses as much as digits as its factorization.

210730217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 210730217 is about 14516.5497622541. The cubic root of 210730217 is about 595.0803431747.

Adding to 210730217 its reverse (712037012), we get a palindrome (922767229).

The spelling of 210730217 in words is "two hundred ten million, seven hundred thirty thousand, two hundred seventeen".