13686221 has 8 divisors (see below), whose sum is σ = 14256384. Its totient is φ = 13124160.

The previous prime is 13686193. The next prime is 13686229. The reversal of 13686221 is 12268631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13686221 - 2¹⁴ = 13669837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13686229) 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 7 ways as a sum of consecutive naturals, for example, 1550 + ... + 5456.

It is an arithmetic number, because the mean of its divisors is an integer number (1782048).

Almost surely, 2^13686221 is an apocalyptic number.

It is an amenable number.

13686221 is a deficient number, since it is larger than the sum of its proper divisors (570163).

13686221 is a wasteful number, since it uses less digits than its factorization.

13686221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051.

The product of its digits is 3456, while the sum is 29.

The square root of 13686221 is about 3699.4892890776. The cubic root of 13686221 is about 239.2000041480.

The spelling of 13686221 in words is "thirteen million, six hundred eighty-six thousand, two hundred twenty-one".