13040021205 has 24 divisors (see below), whose sum is σ = 22606222392. Its totient is φ = 6953595264.

The previous prime is 13040021191. The next prime is 13040021227. The reversal of 13040021205 is 50212004031.

It can be written as a sum of positive squares in 4 ways, for example, as 1549681956 + 11490339249 = 39366^2 + 107193^2 .

It is not a de Polignac number, because 13040021205 - 2⁷ = 13040021077 is a prime.

It is a congruent number.

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, 330387 + ... + 367743.

It is an arithmetic number, because the mean of its divisors is an integer number (941925933).

Almost surely, 2^13040021205 is an apocalyptic number.

13040021205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13040021205 is a deficient number, since it is larger than the sum of its proper divisors (9566201187).

13040021205 is a wasteful number, since it uses less digits than its factorization.

13040021205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45125 (or 45122 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 13040021205 its reverse (50212004031), we get a palindrome (63252025236).

The spelling of 13040021205 in words is "thirteen billion, forty million, twenty-one thousand, two hundred five".