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BaseRepresentation
bin10000111110000011…
…101011111111100010
31202000212001212212012
4100332003223333202
5244304040220302
612212015432522
71213351066424
oct207603537742
952025055765
1018221023202
117800324468
123646225742
131944c68945
14c4bd22814
157199b6a52
hex43e0ebfe2

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".