1320002021321 has 4 divisors (see below), whose sum is σ = 1331683455252. Its totient is φ = 1308320587392.

The previous prime is 1320002021309. The next prime is 1320002021329. The reversal of 1320002021321 is 1231202000231.

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 215726807296 + 1104275214025 = 464464^2 + 1050845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320002021321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320002021321.

It is not an unprimeable number, because it can be changed into a prime (1320002021329) 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 3 ways as a sum of consecutive naturals, for example, 5840716796 + ... + 5840717021.

It is an arithmetic number, because the mean of its divisors is an integer number (332920863813).

Almost surely, 2^{1320002021321} is an apocalyptic number.

It is an amenable number.

1320002021321 is a deficient number, since it is larger than the sum of its proper divisors (11681433931).

1320002021321 is a wasteful number, since it uses less digits than its factorization.

1320002021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11681433930.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1320002021321 its reverse (1231202000231), we get a palindrome (2551204021552).

The spelling of 1320002021321 in words is "one trillion, three hundred twenty billion, two million, twenty-one thousand, three hundred twenty-one".