18221433 has 8 divisors (see below), whose sum is σ = 25724448. Its totient is φ = 11433024.

The previous prime is 18221431. The next prime is 18221443. The reversal of 18221433 is 33412281.

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

It is not a de Polignac number, because 18221433 - 2¹ = 18221431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18221431) 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, 178591 + ... + 178692.

It is an arithmetic number, because the mean of its divisors is an integer number (3215556).

Almost surely, 2^18221433 is an apocalyptic number.

It is an amenable number.

18221433 is a deficient number, since it is larger than the sum of its proper divisors (7503015).

18221433 is a wasteful number, since it uses less digits than its factorization.

18221433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357303.

The product of its digits is 1152, while the sum is 24.

The square root of 18221433 is about 4268.6570487684. The cubic root of 18221433 is about 263.1444266420.

The spelling of 18221433 in words is "eighteen million, two hundred twenty-one thousand, four hundred thirty-three".