1313221201331 has 4 divisors (see below), whose sum is σ = 1414238216832. Its totient is φ = 1212204185832.

The previous prime is 1313221201321. The next prime is 1313221201349. The reversal of 1313221201331 is 1331021223131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1313221201331 - 2⁶ = 1313221201267 is a prime.

It is a super-2 number, since 2×1313221201331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313221201297 and 1313221201306.

It is not an unprimeable number, because it can be changed into a prime (1313221201321) 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, 50508507731 + ... + 50508507756.

It is an arithmetic number, because the mean of its divisors is an integer number (353559554208).

Almost surely, 2^{1313221201331} is an apocalyptic number.

1313221201331 is a deficient number, since it is larger than the sum of its proper divisors (101017015501).

1313221201331 is a wasteful number, since it uses less digits than its factorization.

1313221201331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101017015500.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1313221201331 its reverse (1331021223131), we get a palindrome (2644242424462).

The spelling of 1313221201331 in words is "one trillion, three hundred thirteen billion, two hundred twenty-one million, two hundred one thousand, three hundred thirty-one".