1321105005 has 64 divisors (see below), whose sum is σ = 2650579200. Its totient is φ = 618428160.

The previous prime is 1321104991. The next prime is 1321105031. The reversal of 1321105005 is 5005011231.

It is not a de Polignac number, because 1321105005 - 2⁵ = 1321104973 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27727 + ... + 58403.

It is an arithmetic number, because the mean of its divisors is an integer number (41415300).

Almost surely, 2^1321105005 is an apocalyptic number.

1321105005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321105005 is an abundant number, since it is smaller than the sum of its proper divisors (1329474195).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321105005 is a wasteful number, since it uses less digits than its factorization.

1321105005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30731 (or 30725 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 1321105005 is about 36347.0081987500. The cubic root of 1321105005 is about 1097.2673230245.

Adding to 1321105005 its reverse (5005011231), we get a palindrome (6326116236).

The spelling of 1321105005 in words is "one billion, three hundred twenty-one million, one hundred five thousand, five".