213443005 has 4 divisors (see below), whose sum is σ = 256131612. Its totient is φ = 170754400.

The previous prime is 213442993. The next prime is 213443011. The reversal of 213443005 is 500344312.

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 161112249 + 52330756 = 12693^2 + 7234^2 .

It is not a de Polignac number, because 213443005 - 2⁷ = 213442877 is a prime.

It is a Duffinian number.

It is a congruent 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, 21344296 + ... + 21344305.

It is an arithmetic number, because the mean of its divisors is an integer number (64032903).

Almost surely, 2^213443005 is an apocalyptic number.

It is an amenable number.

213443005 is a deficient number, since it is larger than the sum of its proper divisors (42688607).

213443005 is an equidigital number, since it uses as much as digits as its factorization.

213443005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42688606.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 213443005 is about 14609.6887372729. The cubic root of 213443005 is about 597.6230076514.

Adding to 213443005 its reverse (500344312), we get a palindrome (713787317).

The spelling of 213443005 in words is "two hundred thirteen million, four hundred forty-three thousand, five".