320212332221 has 4 divisors (see below), whose sum is σ = 320218825212. Its totient is φ = 320205839232.

The previous prime is 320212332157. The next prime is 320212332227. The reversal of 320212332221 is 122233212023.

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 167886048121 + 152326284100 = 409739^2 + 390290^2 .

It is a cyclic number.

It is not a de Polignac number, because 320212332221 - 2⁶ = 320212332157 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 (320212332227) 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, 3171950 + ... + 3271343.

It is an arithmetic number, because the mean of its divisors is an integer number (80054706303).

Almost surely, 2^320212332221 is an apocalyptic number.

It is an amenable number.

320212332221 is a deficient number, since it is larger than the sum of its proper divisors (6492991).

320212332221 is an equidigital number, since it uses as much as digits as its factorization.

320212332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6492990.

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

Adding to 320212332221 its reverse (122233212023), we get a palindrome (442445544244).

The spelling of 320212332221 in words is "three hundred twenty billion, two hundred twelve million, three hundred thirty-two thousand, two hundred twenty-one".