13418221 has 4 divisors (see below), whose sum is σ = 13428352. Its totient is φ = 13408092.

The previous prime is 13418201. The next prime is 13418243. The reversal of 13418221 is 12281431.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12281431 = 607 ⋅20233.

It is a cyclic number.

It is not a de Polignac number, because 13418221 - 2⁵ = 13418189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13418192 and 13418201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13418201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2715 + ... + 5848.

It is an arithmetic number, because the mean of its divisors is an integer number (3357088).

Almost surely, 2^13418221 is an apocalyptic number.

It is an amenable number.

13418221 is a deficient number, since it is larger than the sum of its proper divisors (10131).

13418221 is an equidigital number, since it uses as much as digits as its factorization.

13418221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10130.

The product of its digits is 384, while the sum is 22.

The square root of 13418221 is about 3663.0889970079. The cubic root of 13418221 is about 237.6283834046.

Adding to 13418221 its reverse (12281431), we get a palindrome (25699652).

The spelling of 13418221 in words is "thirteen million, four hundred eighteen thousand, two hundred twenty-one".