212135305 has 4 divisors (see below), whose sum is σ = 254562372. Its totient is φ = 169708240.

The previous prime is 212135293. The next prime is 212135347. The reversal of 212135305 is 503531212.

212135305 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 155825289 + 56310016 = 12483^2 + 7504^2 .

It is not a de Polignac number, because 212135305 - 2⁷ = 212135177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21213526 + ... + 21213535.

It is an arithmetic number, because the mean of its divisors is an integer number (63640593).

Almost surely, 2^212135305 is an apocalyptic number.

It is an amenable number.

212135305 is a deficient number, since it is larger than the sum of its proper divisors (42427067).

212135305 is an equidigital number, since it uses as much as digits as its factorization.

212135305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42427066.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 212135305 is about 14564.8654302057. The cubic root of 212135305 is about 596.4000221689.

Adding to 212135305 its reverse (503531212), we get a palindrome (715666517).

The spelling of 212135305 in words is "two hundred twelve million, one hundred thirty-five thousand, three hundred five".