13241221 has 6 divisors (see below), whose sum is σ = 15403110. Its totient is φ = 11349576.

The previous prime is 13241219. The next prime is 13241243. The reversal of 13241221 is 12214231.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 893025 = 3514^2 + 945^2 .

It is not a de Polignac number, because 13241221 - 2¹ = 13241219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13241195 and 13241204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13241021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 135066 + ... + 135163.

It is an arithmetic number, because the mean of its divisors is an integer number (2567185).

Almost surely, 2^13241221 is an apocalyptic number.

It is an amenable number.

13241221 is a deficient number, since it is larger than the sum of its proper divisors (2161889).

13241221 is an equidigital number, since it uses as much as digits as its factorization.

13241221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270243 (or 270236 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 13241221 is about 3638.8488564380. The cubic root of 13241221 is about 236.5789017518.

Adding to 13241221 its reverse (12214231), we get a palindrome (25455452).

The spelling of 13241221 in words is "thirteen million, two hundred forty-one thousand, two hundred twenty-one".