320104515221 has 4 divisors (see below), whose sum is σ = 320246722944. Its totient is φ = 319962307500.

The previous prime is 320104515209. The next prime is 320104515233. The reversal of 320104515221 is 122515401023.

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: 122515401023 = 83777 ⋅1462399.

It is an interprime number because it is at equal distance from previous prime (320104515209) and next prime (320104515233).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320104515221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320104515251) 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, 71100485 + ... + 71104986.

It is an arithmetic number, because the mean of its divisors is an integer number (80061680736).

Almost surely, 2^320104515221 is an apocalyptic number.

It is an amenable number.

320104515221 is a deficient number, since it is larger than the sum of its proper divisors (142207723).

320104515221 is a wasteful number, since it uses less digits than its factorization.

320104515221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142207722.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 320104515221 its reverse (122515401023), we get a palindrome (442619916244).

The spelling of 320104515221 in words is "three hundred twenty billion, one hundred four million, five hundred fifteen thousand, two hundred twenty-one".