21118803 has 8 divisors (see below), whose sum is σ = 28182528. Its totient is φ = 14067144.

The previous prime is 21118789. The next prime is 21118817. The reversal of 21118803 is 30881112.

It is an interprime number because it is at equal distance from previous prime (21118789) and next prime (21118817).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21118803 - 2⁴ = 21118787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21118883) 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 7 ways as a sum of consecutive naturals, for example, 2526 + ... + 6972.

It is an arithmetic number, because the mean of its divisors is an integer number (3522816).

Almost surely, 2^21118803 is an apocalyptic number.

21118803 is a deficient number, since it is larger than the sum of its proper divisors (7063725).

21118803 is a wasteful number, since it uses less digits than its factorization.

21118803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6033.

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

The square root of 21118803 is about 4595.5198835387. The cubic root of 21118803 is about 276.4117070206.

Adding to 21118803 its reverse (30881112), we get a palindrome (51999915).

The spelling of 21118803 in words is "twenty-one million, one hundred eighteen thousand, eight hundred three".