320404021121 has 4 divisors (see below), whose sum is σ = 320445355332. Its totient is φ = 320362686912.

The previous prime is 320404021081. The next prime is 320404021153. The reversal of 320404021121 is 121120404023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121120404023 = 97 ⋅1248663959.

It can be written as a sum of positive squares in 2 ways, for example, as 181591890496 + 138812130625 = 426136^2 + 372575^2 .

It is a cyclic number.

It is not a de Polignac number, because 320404021121 - 2¹⁴ = 320404004737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320404021093 and 320404021102.

It is not an unprimeable number, because it can be changed into a prime (320404021181) 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, 20655476 + ... + 20670981.

It is an arithmetic number, because the mean of its divisors is an integer number (80111338833).

Almost surely, 2^320404021121 is an apocalyptic number.

It is an amenable number.

320404021121 is a deficient number, since it is larger than the sum of its proper divisors (41334211).

320404021121 is an equidigital number, since it uses as much as digits as its factorization.

320404021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41334210.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 320404021121 its reverse (121120404023), we get a palindrome (441524425144).

The spelling of 320404021121 in words is "three hundred twenty billion, four hundred four million, twenty-one thousand, one hundred twenty-one".