213310323221 has 4 divisors (see below), whose sum is σ = 213636985932. Its totient is φ = 212983660512.

The previous prime is 213310323211. The next prime is 213310323229. The reversal of 213310323221 is 122323013312.

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 36056692996 + 177253630225 = 189886^2 + 421015^2 .

It is a cyclic number.

It is not a de Polignac number, because 213310323221 - 2¹⁴ = 213310306837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213310323229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163330376 + ... + 163331681.

It is an arithmetic number, because the mean of its divisors is an integer number (53409246483).

Almost surely, 2^213310323221 is an apocalyptic number.

It is an amenable number.

213310323221 is a deficient number, since it is larger than the sum of its proper divisors (326662711).

213310323221 is an equidigital number, since it uses as much as digits as its factorization.

213310323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326662710.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 213310323221 its reverse (122323013312), we get a palindrome (335633336533).

The spelling of 213310323221 in words is "two hundred thirteen billion, three hundred ten million, three hundred twenty-three thousand, two hundred twenty-one".