18821103 has 16 divisors (see below), whose sum is σ = 29291520. Its totient is φ = 10525536.

The previous prime is 18821083. The next prime is 18821111. The reversal of 18821103 is 30112881.

It is not a de Polignac number, because 18821103 - 2⁵ = 18821071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18821903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8548 + ... + 10521.

It is an arithmetic number, because the mean of its divisors is an integer number (1830720).

Almost surely, 2^18821103 is an apocalyptic number.

18821103 is a deficient number, since it is larger than the sum of its proper divisors (10470417).

18821103 is a wasteful number, since it uses less digits than its factorization.

18821103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19126.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 18821103 is about 4338.3295172220. The cubic root of 18821103 is about 266.0000329772. Note that the first 4 decimals are identical.

Adding to 18821103 its reverse (30112881), we get a palindrome (48933984).

It can be divided in two parts, 18 and 821103, that added together give a triangular number (821121 = T₁₂₈₁).

The spelling of 18821103 in words is "eighteen million, eight hundred twenty-one thousand, one hundred three".