13021385 has 8 divisors (see below), whose sum is σ = 16827720. Its totient is φ = 9615744.

The previous prime is 13021367. The next prime is 13021387. The reversal of 13021385 is 58312031.

It can be written as a sum of positive squares in 4 ways, for example, as 2085136 + 10936249 = 1444^2 + 3307^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13021385 - 2¹⁰ = 13020361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13021385.

It is not an unprimeable number, because it can be changed into a prime (13021387) 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 7 ways as a sum of consecutive naturals, for example, 100100 + ... + 100229.

It is an arithmetic number, because the mean of its divisors is an integer number (2103465).

Almost surely, 2^13021385 is an apocalyptic number.

It is an amenable number.

13021385 is a deficient number, since it is larger than the sum of its proper divisors (3806335).

13021385 is a wasteful number, since it uses less digits than its factorization.

13021385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200347.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 13021385 is about 3608.5156228012. The cubic root of 13021385 is about 235.2623296579.

The spelling of 13021385 in words is "thirteen million, twenty-one thousand, three hundred eighty-five".