1321311105 has 24 divisors (see below), whose sum is σ = 2291807232. Its totient is φ = 704227104.

The previous prime is 1321311029. The next prime is 1321311119. The reversal of 1321311105 is 5011131231.

It is not a de Polignac number, because 1321311105 - 2⁹ = 1321310593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64192 + ... + 82238.

It is an arithmetic number, because the mean of its divisors is an integer number (95491968).

Almost surely, 2^1321311105 is an apocalyptic number.

1321311105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321311105 is a deficient number, since it is larger than the sum of its proper divisors (970496127).

1321311105 is a wasteful number, since it uses less digits than its factorization.

1321311105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19685 (or 19682 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1321311105 is about 36349.8432596346. The cubic root of 1321311105 is about 1097.3243800678.

Adding to 1321311105 its reverse (5011131231), we get a palindrome (6332442336).

The spelling of 1321311105 in words is "one billion, three hundred twenty-one million, three hundred eleven thousand, one hundred five".