13126221 has 6 divisors (see below), whose sum is σ = 18960110. Its totient is φ = 8750808.

The previous prime is 13126219. The next prime is 13126259. The reversal of 13126221 is 12262131.

It can be written as a sum of positive squares in only one way, i.e., 10150596 + 2975625 = 3186^2 + 1725^2 .

It is not a de Polignac number, because 13126221 - 2¹ = 13126219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13126194 and 13126203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13126271) 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, 729226 + ... + 729243.

Almost surely, 2^13126221 is an apocalyptic number.

It is an amenable number.

13126221 is a deficient number, since it is larger than the sum of its proper divisors (5833889).

13126221 is a wasteful number, since it uses less digits than its factorization.

13126221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458475 (or 1458472 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 13126221 is about 3623.0126966380. The cubic root of 13126221 is about 235.8920134612.

Adding to 13126221 its reverse (12262131), we get a palindrome (25388352).

The spelling of 13126221 in words is "thirteen million, one hundred twenty-six thousand, two hundred twenty-one".