1321105311 has 6 divisors (see below), whose sum is σ = 1908263240. Its totient is φ = 880736868.

The previous prime is 1321105249. The next prime is 1321105333. The reversal of 1321105311 is 1135011231.

1321105311 is a `hidden beast` number, since 132 + 1 + 1 + 0 + 531 + 1 = 666.

It is not a de Polignac number, because 1321105311 - 2¹³ = 1321097119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321105711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73394731 + ... + 73394748.

Almost surely, 2^1321105311 is an apocalyptic number.

1321105311 is a deficient number, since it is larger than the sum of its proper divisors (587157929).

1321105311 is a wasteful number, since it uses less digits than its factorization.

1321105311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146789485 (or 146789482 counting only the distinct ones).

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

The square root of 1321105311 is about 36347.0124081746. The cubic root of 1321105311 is about 1097.2674077424.

Adding to 1321105311 its reverse (1135011231), we get a palindrome (2456116542).

The spelling of 1321105311 in words is "one billion, three hundred twenty-one million, one hundred five thousand, three hundred eleven".