18221023202 has 18 divisors (see below), whose sum is σ = 28250813259.
Its totient is φ = 8813760660.
The previous prime is 18221023193. The next prime is 18221023207. The reversal of 18221023202 is 20232012281.
Adding to 18221023202 its reverse (20232012281), we get a palindrome (38453035483).
It can be written as a sum of positive squares in only one way, i.e., 9110511601 + 9110511601 = 95449^2 + 95449^2
It is an ABA number since it can be written as A⋅BA, here for A=2, B=95449.
It is a Duffinian number.
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 8 ways as a sum of consecutive naturals, for example, 5916299 + ... + 5919377.
Almost surely, 218221023202 is an apocalyptic number.
18221023202 is a deficient number, since it is larger than the sum of its proper divisors (10029790057).
18221023202 is an frugal number, since it uses more digits than its factorization.
18221023202 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6222 (or 3112 counting only the distinct ones).
The product of its (nonzero) digits is 768, while the sum is 23.
The spelling of 18221023202 in words is "eighteen billion, two hundred twenty-one million, twenty-three thousand, two hundred two".