18821133 has 8 divisors (see below), whose sum is σ = 27883200. Its totient is φ = 12547404.

The previous prime is 18821119. The next prime is 18821137. The reversal of 18821133 is 33112881.

It is not a de Polignac number, because 18821133 - 2¹⁴ = 18804749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 697079 = 18821133 / (1 + 8 + 8 + 2 + 1 + 1 + 3 + 3).

It is a junction number, because it is equal to n+sod(n) for n = 18821097 and 18821106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18821137) 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 7 ways as a sum of consecutive naturals, for example, 348513 + ... + 348566.

It is an arithmetic number, because the mean of its divisors is an integer number (3485400).

Almost surely, 2^18821133 is an apocalyptic number.

It is an amenable number.

18821133 is a deficient number, since it is larger than the sum of its proper divisors (9062067).

18821133 is an equidigital number, since it uses as much as digits as its factorization.

18821133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697088 (or 697082 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 18821133 is about 4338.3329747727. The cubic root of 18821133 is about 266.0001743078. Note that the first 3 decimals are identical.

It can be divided in two parts, 188 and 21133, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 18821133 in words is "eighteen million, eight hundred twenty-one thousand, one hundred thirty-three".