210345305 has 4 divisors (see below), whose sum is σ = 252414372. Its totient is φ = 168276240.

The previous prime is 210345299. The next prime is 210345307. The reversal of 210345305 is 503543012.

210345305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 38105929 + 172239376 = 6173^2 + 13124^2 .

It is not a de Polignac number, because 210345305 - 2⁶ = 210345241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210345307) 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, 21034526 + ... + 21034535.

It is an arithmetic number, because the mean of its divisors is an integer number (63103593).

Almost surely, 2^210345305 is an apocalyptic number.

It is an amenable number.

210345305 is a deficient number, since it is larger than the sum of its proper divisors (42069067).

210345305 is an equidigital number, since it uses as much as digits as its factorization.

210345305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42069066.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 210345305 is about 14503.2860069710. The cubic root of 210345305 is about 594.7178051229.

Adding to 210345305 its reverse (503543012), we get a palindrome (713888317).

The spelling of 210345305 in words is "two hundred ten million, three hundred forty-five thousand, three hundred five".