13825221 has 4 divisors (see below), whose sum is σ = 18433632. Its totient is φ = 9216812.

The previous prime is 13825213. The next prime is 13825243. The reversal of 13825221 is 12252831.

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.

It is a cyclic number.

It is not a de Polignac number, because 13825221 - 2³ = 13825213 is a prime.

It is a super-2 number, since 2×13825221² = 382273471397682, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13825191 and 13825200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13825261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2304201 + ... + 2304206.

It is an arithmetic number, because the mean of its divisors is an integer number (4608408).

Almost surely, 2^13825221 is an apocalyptic number.

It is an amenable number.

13825221 is a deficient number, since it is larger than the sum of its proper divisors (4608411).

13825221 is an equidigital number, since it uses as much as digits as its factorization.

13825221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608410.

The product of its digits is 960, while the sum is 24.

The square root of 13825221 is about 3718.2282070900. The cubic root of 13825221 is about 240.0070657642.

The spelling of 13825221 in words is "thirteen million, eight hundred twenty-five thousand, two hundred twenty-one".