320423041721 has 4 divisors (see below), whose sum is σ = 322728243600. Its totient is φ = 318117839844.

The previous prime is 320423041691. The next prime is 320423041747. The reversal of 320423041721 is 127140324023.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127140324023 = 22541 ⋅5640403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320423041721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320423041321) 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, 1152600731 + ... + 1152601008.

It is an arithmetic number, because the mean of its divisors is an integer number (80682060900).

Almost surely, 2^320423041721 is an apocalyptic number.

It is an amenable number.

320423041721 is a deficient number, since it is larger than the sum of its proper divisors (2305201879).

320423041721 is a wasteful number, since it uses less digits than its factorization.

320423041721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305201878.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 320423041721 its reverse (127140324023), we get a palindrome (447563365744).

The spelling of 320423041721 in words is "three hundred twenty billion, four hundred twenty-three million, forty-one thousand, seven hundred twenty-one".