18213100 has 18 divisors (see below), whose sum is σ = 39522644. Its totient is φ = 7285200.

The previous prime is 18213067. The next prime is 18213101. The reversal of 18213100 is 131281.

It is a super-2 number, since 2×18213100² = 663434023220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18213101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90966 + ... + 91165.

Almost surely, 2^18213100 is an apocalyptic number.

18213100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18213100 is an abundant number, since it is smaller than the sum of its proper divisors (21309544).

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

18213100 is a wasteful number, since it uses less digits than its factorization.

18213100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182145 (or 182138 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 18213100 is about 4267.6808690435. The cubic root of 18213100 is about 263.1043069130.

Adding to 18213100 its reverse (131281), we get a palindrome (18344381).

The spelling of 18213100 in words is "eighteen million, two hundred thirteen thousand, one hundred".