13105221 has 4 divisors (see below), whose sum is σ = 17473632. Its totient is φ = 8736812.

The previous prime is 13105217. The next prime is 13105247. The reversal of 13105221 is 12250131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12250131 = 3 ⋅4083377.

It is a cyclic number.

It is not a de Polignac number, because 13105221 - 2² = 13105217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13105221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13105121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2184201 + ... + 2184206.

It is an arithmetic number, because the mean of its divisors is an integer number (4368408).

Almost surely, 2^13105221 is an apocalyptic number.

It is an amenable number.

13105221 is a deficient number, since it is larger than the sum of its proper divisors (4368411).

13105221 is an equidigital number, since it uses as much as digits as its factorization.

13105221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4368410.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 13105221 is about 3620.1133960140. The cubic root of 13105221 is about 235.7661489447.

Adding to 13105221 its reverse (12250131), we get a palindrome (25355352).

The spelling of 13105221 in words is "thirteen million, one hundred five thousand, two hundred twenty-one".