13115221 has 24 divisors (see below), whose sum is σ = 16490880. Its totient is φ = 10186176.

The previous prime is 13115197. The next prime is 13115227. The reversal of 13115221 is 12251131.

13115221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13115221 - 2⁹ = 13114709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13115195 and 13115204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13115227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 247431 + ... + 247483.

It is an arithmetic number, because the mean of its divisors is an integer number (687120).

Almost surely, 2^13115221 is an apocalyptic number.

It is an amenable number.

13115221 is a deficient number, since it is larger than the sum of its proper divisors (3375659).

13115221 is an equidigital number, since it uses as much as digits as its factorization.

13115221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 112 counting only the distinct ones).

The product of its digits is 60, while the sum is 16.

The square root of 13115221 is about 3621.4943048416. The cubic root of 13115221 is about 235.8261011848.

Adding to 13115221 its reverse (12251131), we get a palindrome (25366352).

The spelling of 13115221 in words is "thirteen million, one hundred fifteen thousand, two hundred twenty-one".