213042305 has 16 divisors (see below), whose sum is σ = 298391040. Its totient is φ = 142976832.

The previous prime is 213042299. The next prime is 213042311. The reversal of 213042305 is 503240312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (213042299) and next prime (213042311).

It is a cyclic number.

It is not a de Polignac number, because 213042305 - 2⁶ = 213042241 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 63110 + ... + 66399.

It is an arithmetic number, because the mean of its divisors is an integer number (18649440).

Almost surely, 2^213042305 is an apocalyptic number.

It is an amenable number.

213042305 is a deficient number, since it is larger than the sum of its proper divisors (85348735).

213042305 is a wasteful number, since it uses less digits than its factorization.

213042305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129568.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 213042305 is about 14595.9687927866. The cubic root of 213042305 is about 597.2487976092.

Adding to 213042305 its reverse (503240312), we get a palindrome (716282617).

The spelling of 213042305 in words is "two hundred thirteen million, forty-two thousand, three hundred five".