18221023203 has 8 divisors (see below), whose sum is σ = 24380545728. Its totient is φ = 12104424744.

The previous prime is 18221023193. The next prime is 18221023207. The reversal of 18221023203 is 30232012281.

It is a happy number.

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

It is not a de Polignac number, because 18221023203 - 2⁹ = 18221022691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18221023207) 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, 10730025 + ... + 10731722.

It is an arithmetic number, because the mean of its divisors is an integer number (3047568216).

Almost surely, 2^18221023203 is an apocalyptic number.

18221023203 is a deficient number, since it is larger than the sum of its proper divisors (6159522525).

18221023203 is a wasteful number, since it uses less digits than its factorization.

18221023203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21462033.

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

Adding to 18221023203 its reverse (30232012281), we get a palindrome (48453035484).

The spelling of 18221023203 in words is "eighteen billion, two hundred twenty-one million, twenty-three thousand, two hundred three".