210242513 has 4 divisors (see below), whose sum is σ = 226415028. Its totient is φ = 194070000.

The previous prime is 210242507. The next prime is 210242521. The reversal of 210242513 is 315242012.

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 69772609 + 140469904 = 8353^2 + 11852^2 .

It is a cyclic number.

It is not a de Polignac number, because 210242513 - 2⁴ = 210242497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210245513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8086238 + ... + 8086263.

It is an arithmetic number, because the mean of its divisors is an integer number (56603757).

Almost surely, 2^210242513 is an apocalyptic number.

It is an amenable number.

210242513 is a deficient number, since it is larger than the sum of its proper divisors (16172515).

210242513 is a wasteful number, since it uses less digits than its factorization.

210242513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16172514.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 210242513 is about 14499.7418252878. The cubic root of 210242513 is about 594.6209133423.

Adding to 210242513 its reverse (315242012), we get a palindrome (525484525).

The spelling of 210242513 in words is "two hundred ten million, two hundred forty-two thousand, five hundred thirteen".