213002665 has 4 divisors (see below), whose sum is σ = 255603204. Its totient is φ = 170402128.

The previous prime is 213002663. The next prime is 213002681. The reversal of 213002665 is 566200312.

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 97397161 + 115605504 = 9869^2 + 10752^2 .

It is a cyclic number.

It is not a de Polignac number, because 213002665 - 2¹ = 213002663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213002663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21300262 + ... + 21300271.

It is an arithmetic number, because the mean of its divisors is an integer number (63900801).

Almost surely, 2^213002665 is an apocalyptic number.

It is an amenable number.

213002665 is a deficient number, since it is larger than the sum of its proper divisors (42600539).

213002665 is an equidigital number, since it uses as much as digits as its factorization.

213002665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42600538.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 213002665 is about 14594.6108204364. The cubic root of 213002665 is about 597.2117526807.

Adding to 213002665 its reverse (566200312), we get a palindrome (779202977).

The spelling of 213002665 in words is "two hundred thirteen million, two thousand, six hundred sixty-five".