13121305 has 16 divisors (see below), whose sum is σ = 16862400. Its totient is φ = 9771840.

The previous prime is 13121291. The next prime is 13121309. The reversal of 13121305 is 50312131.

It is not a de Polignac number, because 13121305 - 2¹⁷ = 12990233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13121309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4435 + ... + 6775.

It is an arithmetic number, because the mean of its divisors is an integer number (1053900).

Almost surely, 2^13121305 is an apocalyptic number.

It is an amenable number.

13121305 is a deficient number, since it is larger than the sum of its proper divisors (3741095).

13121305 is a wasteful number, since it uses less digits than its factorization.

13121305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 13121305 is about 3622.3341922026. The cubic root of 13121305 is about 235.8625612186.

Adding to 13121305 its reverse (50312131), we get a palindrome (63433436).

The spelling of 13121305 in words is "thirteen million, one hundred twenty-one thousand, three hundred five".