21089103 has 32 divisors (see below), whose sum is σ = 33188352. Its totient is φ = 11664000.

The previous prime is 21089093. The next prime is 21089111. The reversal of 21089103 is 30198012.

It is not a de Polignac number, because 21089103 - 2⁴ = 21089087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21089203) 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 31 ways as a sum of consecutive naturals, for example, 129300 + ... + 129462.

It is an arithmetic number, because the mean of its divisors is an integer number (1037136).

Almost surely, 2^21089103 is an apocalyptic number.

21089103 is a deficient number, since it is larger than the sum of its proper divisors (12099249).

21089103 is a wasteful number, since it uses less digits than its factorization.

21089103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21089103 is about 4592.2873385711. The cubic root of 21089103 is about 276.2820708997.

It can be divided in two parts, 2108 and 9103, that added together give a palindrome (11211).

The spelling of 21089103 in words is "twenty-one million, eighty-nine thousand, one hundred three".