320013200303021 has 4 divisors (see below), whose sum is σ = 323608854239100. Its totient is φ = 316417546366944.

The previous prime is 320013200303003. The next prime is 320013200303029. The reversal of 320013200303021 is 120303002310023.

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 224741174476900 + 95272025826121 = 14991370^2 + 9760739^2 .

It is a cyclic number.

It is not a de Polignac number, because 320013200303021 - 2¹⁰ = 320013200301997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320013200302984 and 320013200303002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320013200303029) 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, 1797826967906 + ... + 1797826968083.

It is an arithmetic number, because the mean of its divisors is an integer number (80902213559775).

Almost surely, 2^{320013200303021} is an apocalyptic number.

It is an amenable number.

320013200303021 is a deficient number, since it is larger than the sum of its proper divisors (3595653936079).

320013200303021 is an equidigital number, since it uses as much as digits as its factorization.

320013200303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3595653936078.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 320013200303021 its reverse (120303002310023), we get a palindrome (440316202613044).

The spelling of 320013200303021 in words is "three hundred twenty trillion, thirteen billion, two hundred million, three hundred three thousand, twenty-one".