210120217 has 2 divisors, whose sum is σ = 210120218. Its totient is φ = 210120216.

The previous prime is 210120193. The next prime is 210120233. The reversal of 210120217 is 712021012.

It is an a-pointer prime, because the next prime (210120233) can be obtained adding 210120217 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169937296 + 40182921 = 13036^2 + 6339^2 .

It is a cyclic number.

It is not a de Polignac number, because 210120217 - 2²³ = 201731609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210120217.

It is not a weakly prime, because it can be changed into another prime (210120257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060108 + 105060109.

It is an arithmetic number, because the mean of its divisors is an integer number (105060109).

Almost surely, 2^210120217 is an apocalyptic number.

It is an amenable number.

210120217 is a deficient number, since it is larger than the sum of its proper divisors (1).

210120217 is an equidigital number, since it uses as much as digits as its factorization.

210120217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 210120217 is about 14495.5240333008. The cubic root of 210120217 is about 594.5055959360.

Adding to 210120217 its reverse (712021012), we get a palindrome (922141229).

The spelling of 210120217 in words is "two hundred ten million, one hundred twenty thousand, two hundred seventeen".