18221367 has 8 divisors (see below), whose sum is σ = 25133040. Its totient is φ = 11728640.

The previous prime is 18221341. The next prime is 18221389. The reversal of 18221367 is 76312281.

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

It is a cyclic number.

It is not a de Polignac number, because 18221367 - 2¹¹ = 18219319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104634 + ... + 104807.

It is an arithmetic number, because the mean of its divisors is an integer number (3141630).

Almost surely, 2^18221367 is an apocalyptic number.

18221367 is a deficient number, since it is larger than the sum of its proper divisors (6911673).

18221367 is a wasteful number, since it uses less digits than its factorization.

18221367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209473.

The product of its digits is 4032, while the sum is 30.

The square root of 18221367 is about 4268.6493179928. The cubic root of 18221367 is about 263.1441089291.

The spelling of 18221367 in words is "eighteen million, two hundred twenty-one thousand, three hundred sixty-seven".