210105317 has 4 divisors (see below), whose sum is σ = 210313740. Its totient is φ = 209896896.

The previous prime is 210105281. The next prime is 210105341. The reversal of 210105317 is 713501012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1331716 + 208773601 = 1154^2 + 14449^2 .

It is a cyclic number.

It is not a de Polignac number, because 210105317 - 2⁸ = 210105061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210105517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102692 + ... + 104717.

It is an arithmetic number, because the mean of its divisors is an integer number (52578435).

Almost surely, 2^210105317 is an apocalyptic number.

It is an amenable number.

210105317 is a deficient number, since it is larger than the sum of its proper divisors (208423).

210105317 is a wasteful number, since it uses less digits than its factorization.

210105317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208422.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 210105317 is about 14495.0100724353. The cubic root of 210105317 is about 594.4915431191.

Adding to 210105317 its reverse (713501012), we get a palindrome (923606329).

The spelling of 210105317 in words is "two hundred ten million, one hundred five thousand, three hundred seventeen".