18121110 has 32 divisors (see below), whose sum is σ = 49704192. Its totient is φ = 4141920.

The previous prime is 18121093. The next prime is 18121123. The reversal of 18121110 is 1112181.

18121110 is nontrivially palindromic in base 12.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18121110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42936 + ... + 43355.

It is an arithmetic number, because the mean of its divisors is an integer number (1553256).

Almost surely, 2^18121110 is an apocalyptic number.

18121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18121110 is an abundant number, since it is smaller than the sum of its proper divisors (31583082).

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

18121110 is a wasteful number, since it uses less digits than its factorization.

18121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86308.

The product of its (nonzero) digits is 16, while the sum is 15.

The square root of 18121110 is about 4256.8897096354. The cubic root of 18121110 is about 262.6606001359.

Adding to 18121110 its reverse (1112181), we get a palindrome (19233291).

The spelling of 18121110 in words is "eighteen million, one hundred twenty-one thousand, one hundred ten".