18221043 has 8 divisors (see below), whose sum is σ = 24390288. Its totient is φ = 12099584.

The previous prime is 18221041. The next prime is 18221081. The reversal of 18221043 is 34012281.

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 18221043 - 2¹ = 18221041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18221041) 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, 11046 + ... + 12587.

It is an arithmetic number, because the mean of its divisors is an integer number (3048786).

Almost surely, 2^18221043 is an apocalyptic number.

18221043 is a deficient number, since it is larger than the sum of its proper divisors (6169245).

18221043 is a wasteful number, since it uses less digits than its factorization.

18221043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23893.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18221043 is about 4268.6113667093. The cubic root of 18221043 is about 263.1425492364.

The spelling of 18221043 in words is "eighteen million, two hundred twenty-one thousand, forty-three".