320423233021 has 2 divisors, whose sum is σ = 320423233022. Its totient is φ = 320423233020.

The previous prime is 320423233019. The next prime is 320423233033. The reversal of 320423233021 is 120332324023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316209405625 + 4213827396 = 562325^2 + 64914^2 .

It is an emirp because it is prime and its reverse (120332324023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320423233021 - 2¹ = 320423233019 is a prime.

It is a super-3 number, since 3×320423233021³ (a number of 35 digits) contains 333 as substring.

Together with 320423233019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320423233051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160211616510 + 160211616511.

It is an arithmetic number, because the mean of its divisors is an integer number (160211616511).

Almost surely, 2^320423233021 is an apocalyptic number.

It is an amenable number.

320423233021 is a deficient number, since it is larger than the sum of its proper divisors (1).

320423233021 is an equidigital number, since it uses as much as digits as its factorization.

320423233021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 320423233021 its reverse (120332324023), we get a palindrome (440755557044).

The spelling of 320423233021 in words is "three hundred twenty billion, four hundred twenty-three million, two hundred thirty-three thousand, twenty-one".