18221103 has 6 divisors (see below), whose sum is σ = 26319384. Its totient is φ = 12147396.

The previous prime is 18221081. The next prime is 18221123. The reversal of 18221103 is 30112281.

It is not a de Polignac number, because 18221103 - 2⁸ = 18220847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1012275 + ... + 1012292.

It is an arithmetic number, because the mean of its divisors is an integer number (4386564).

Almost surely, 2^18221103 is an apocalyptic number.

18221103 is a deficient number, since it is larger than the sum of its proper divisors (8098281).

18221103 is a wasteful number, since it uses less digits than its factorization.

18221103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024573 (or 2024570 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18221103 is about 4268.6183947502. The cubic root of 18221103 is about 263.1428380698.

Adding to 18221103 its reverse (30112281), we get a palindrome (48333384).

The spelling of 18221103 in words is "eighteen million, two hundred twenty-one thousand, one hundred three".