213105305 has 8 divisors (see below), whose sum is σ = 292258752. Its totient is φ = 146129328.

The previous prime is 213105301. The next prime is 213105307. The reversal of 213105305 is 503501312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213105305 - 2² = 213105301 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 (213105301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3044327 + ... + 3044396.

It is an arithmetic number, because the mean of its divisors is an integer number (36532344).

Almost surely, 2^213105305 is an apocalyptic number.

It is an amenable number.

213105305 is a deficient number, since it is larger than the sum of its proper divisors (79153447).

213105305 is an equidigital number, since it uses as much as digits as its factorization.

213105305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6088735.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 213105305 is about 14598.1267633899. The cubic root of 213105305 is about 597.3076637984.

Adding to 213105305 its reverse (503501312), we get a palindrome (716606617).

The spelling of 213105305 in words is "two hundred thirteen million, one hundred five thousand, three hundred five".