210742817 has 2 divisors, whose sum is σ = 210742818. Its totient is φ = 210742816.

The previous prime is 210742801. The next prime is 210742823. The reversal of 210742817 is 718247012.

It is a happy number.

210742817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210714256 + 28561 = 14516^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 210742817 - 2⁴ = 210742801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (210742837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105371408 + 105371409.

It is an arithmetic number, because the mean of its divisors is an integer number (105371409).

Almost surely, 2^210742817 is an apocalyptic number.

It is an amenable number.

210742817 is a deficient number, since it is larger than the sum of its proper divisors (1).

210742817 is an equidigital number, since it uses as much as digits as its factorization.

210742817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 210742817 is about 14516.9837431885. The cubic root of 210742817 is about 595.0922033040.

Adding to 210742817 its reverse (718247012), we get a palindrome (928989829).

The spelling of 210742817 in words is "two hundred ten million, seven hundred forty-two thousand, eight hundred seventeen".