13021155205 has 4 divisors (see below), whose sum is σ = 15625386252. Its totient is φ = 10416924160.

The previous prime is 13021155193. The next prime is 13021155211. The reversal of 13021155205 is 50255112031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1425742081 + 11595413124 = 37759^2 + 107682^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13021155205 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13021155205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1302115516 + ... + 1302115525.

It is an arithmetic number, because the mean of its divisors is an integer number (3906346563).

Almost surely, 2^13021155205 is an apocalyptic number.

It is an amenable number.

13021155205 is a deficient number, since it is larger than the sum of its proper divisors (2604231047).

13021155205 is an equidigital number, since it uses as much as digits as its factorization.

13021155205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604231046.

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 13021155205 its reverse (50255112031), we get a palindrome (63276267236).

The spelling of 13021155205 in words is "thirteen billion, twenty-one million, one hundred fifty-five thousand, two hundred five".