213344321 has 4 divisors (see below), whose sum is σ = 213375792. Its totient is φ = 213312852.

The previous prime is 213344311. The next prime is 213344359. The reversal of 213344321 is 123443312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213344321 - 2¹⁰ = 213343297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213344311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 911 + ... + 20676.

It is an arithmetic number, because the mean of its divisors is an integer number (53343948).

Almost surely, 2^213344321 is an apocalyptic number.

It is an amenable number.

213344321 is a deficient number, since it is larger than the sum of its proper divisors (31471).

213344321 is an equidigital number, since it uses as much as digits as its factorization.

213344321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31470.

The product of its digits is 1728, while the sum is 23.

The square root of 213344321 is about 14606.3109990168. The cubic root of 213344321 is about 597.5308910693.

Adding to 213344321 its reverse (123443312), we get a palindrome (336787633).

The spelling of 213344321 in words is "two hundred thirteen million, three hundred forty-four thousand, three hundred twenty-one".