13824221 has 4 divisors (see below), whose sum is σ = 13831872. Its totient is φ = 13816572.

The previous prime is 13824211. The next prime is 13824227. The reversal of 13824221 is 12242831.

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.

It is a cyclic number.

It is not a de Polignac number, because 13824221 - 2¹⁰ = 13823197 is a prime.

It is a super-2 number, since 2×13824221² = 382218172513682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13824227) 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, 566 + ... + 5288.

It is an arithmetic number, because the mean of its divisors is an integer number (3457968).

Almost surely, 2^13824221 is an apocalyptic number.

It is an amenable number.

13824221 is a deficient number, since it is larger than the sum of its proper divisors (7651).

13824221 is an equidigital number, since it uses as much as digits as its factorization.

13824221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7650.

The product of its digits is 768, while the sum is 23.

The square root of 13824221 is about 3718.0937320084. The cubic root of 13824221 is about 240.0012789284.

The spelling of 13824221 in words is "thirteen million, eight hundred twenty-four thousand, two hundred twenty-one".