13221986 has 12 divisors (see below), whose sum is σ = 20932902. Its totient is φ = 6262704.

The previous prime is 13221977. The next prime is 13221997. The reversal of 13221986 is 68912231.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 866761 = 3515^2 + 931^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8435 + ... + 9878.

Almost surely, 2^13221986 is an apocalyptic number.

13221986 is a deficient number, since it is larger than the sum of its proper divisors (7710916).

13221986 is a wasteful number, since it uses less digits than its factorization.

13221986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18353 (or 18334 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 13221986 is about 3636.2048897167. The cubic root of 13221986 is about 236.4642899537.

The spelling of 13221986 in words is "thirteen million, two hundred twenty-one thousand, nine hundred eighty-six".