1000001320321 has 8 divisors (see below), whose sum is σ = 1036728138600. Its totient is φ = 963424103040.

The previous prime is 1000001320259. The next prime is 1000001320327. The reversal of 1000001320321 is 1230231000001.

It can be written as a sum of positive squares in 4 ways, for example, as 2877249600 + 997124070721 = 53640^2 + 998561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000001320321 - 2¹⁵ = 1000001287553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000001320327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37386636 + ... + 37413373.

It is an arithmetic number, because the mean of its divisors is an integer number (129591017325).

Almost surely, 2^{1000001320321} is an apocalyptic number.

It is an amenable number.

1000001320321 is a deficient number, since it is larger than the sum of its proper divisors (36726818279).

1000001320321 is an equidigital number, since it uses as much as digits as its factorization.

1000001320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74800499.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 1000001320321 its reverse (1230231000001), we get a palindrome (2230232320322).

The spelling of 1000001320321 in words is "one trillion, one million, three hundred twenty thousand, three hundred twenty-one".