18221063 has 8 divisors (see below), whose sum is σ = 20917632. Its totient is φ = 15547896.

The previous prime is 18221041. The next prime is 18221081. The reversal of 18221063 is 36012281.

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

It is not a de Polignac number, because 18221063 - 2⁶ = 18220999 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 (18221003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4145 + ... + 7322.

It is an arithmetic number, because the mean of its divisors is an integer number (2614704).

Almost surely, 2^18221063 is an apocalyptic number.

18221063 is a deficient number, since it is larger than the sum of its proper divisors (2696569).

18221063 is a wasteful number, since it uses less digits than its factorization.

18221063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11701.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18221063 is about 4268.6137093909. The cubic root of 18221063 is about 263.1426455143.

The spelling of 18221063 in words is "eighteen million, two hundred twenty-one thousand, sixty-three".