1303231001321 has 2 divisors, whose sum is σ = 1303231001322. Its totient is φ = 1303231001320.

The previous prime is 1303231001309. The next prime is 1303231001357. The reversal of 1303231001321 is 1231001323031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806538705625 + 496692295696 = 898075^2 + 704764^2 .

It is an emirp because it is prime and its reverse (1231001323031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1303231001321 - 2⁶ = 1303231001257 is a prime.

It is a super-2 number, since 2×1303231001321² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1303231001293 and 1303231001302.

It is not a weakly prime, because it can be changed into another prime (1303231001521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651615500660 + 651615500661.

It is an arithmetic number, because the mean of its divisors is an integer number (651615500661).

Almost surely, 2^{1303231001321} is an apocalyptic number.

It is an amenable number.

1303231001321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1303231001321 is an equidigital number, since it uses as much as digits as its factorization.

1303231001321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 1303231001321 its reverse (1231001323031), we get a palindrome (2534232324352).

The spelling of 1303231001321 in words is "one trillion, three hundred three billion, two hundred thirty-one million, one thousand, three hundred twenty-one".