1311103332221 has 4 divisors (see below), whose sum is σ = 1314145335744. Its totient is φ = 1308061328700.

The previous prime is 1311103332197. The next prime is 1311103332223. The reversal of 1311103332221 is 1222333011131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311103332221 is a prime.

It is a super-2 number, since 2×1311103332221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311103332223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521001115 + ... + 1521001976.

It is an arithmetic number, because the mean of its divisors is an integer number (328536333936).

Almost surely, 2^{1311103332221} is an apocalyptic number.

It is an amenable number.

1311103332221 is a deficient number, since it is larger than the sum of its proper divisors (3042003523).

1311103332221 is an equidigital number, since it uses as much as digits as its factorization.

1311103332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042003522.

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

Adding to 1311103332221 its reverse (1222333011131), we get a palindrome (2533436343352).

The spelling of 1311103332221 in words is "one trillion, three hundred eleven billion, one hundred three million, three hundred thirty-two thousand, two hundred twenty-one".