18211100 has 18 divisors (see below), whose sum is σ = 39518304. Its totient is φ = 7284400.

The previous prime is 18211099. The next prime is 18211103. The reversal of 18211100 is 111281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90956 + ... + 91155.

Almost surely, 2^18211100 is an apocalyptic number.

18211100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18211100 is an abundant number, since it is smaller than the sum of its proper divisors (21307204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18211100 is a wasteful number, since it uses less digits than its factorization.

18211100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182125 (or 182118 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 18211100 is about 4267.4465433090. The cubic root of 18211100 is about 263.0946759720.

Adding to 18211100 its reverse (111281), we get a palindrome (18322381).

The spelling of 18211100 in words is "eighteen million, two hundred eleven thousand, one hundred".