21135103 has 8 divisors (see below), whose sum is σ = 23680080. Its totient is φ = 18694080.

The previous prime is 21135073. The next prime is 21135109. The reversal of 21135103 is 30153112.

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

It is a cyclic number.

It is not a de Polignac number, because 21135103 - 2⁵ = 21135071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25558 + ... + 26371.

It is an arithmetic number, because the mean of its divisors is an integer number (2960010).

Almost surely, 2^21135103 is an apocalyptic number.

21135103 is a deficient number, since it is larger than the sum of its proper divisors (2544977).

21135103 is a wasteful number, since it uses less digits than its factorization.

21135103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51977.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 21135103 is about 4597.2930078471. The cubic root of 21135103 is about 276.4828024668.

Adding to 21135103 its reverse (30153112), we get a palindrome (51288215).

Subtracting 21135103 from its reverse (30153112), we obtain a square (9018009 = 3003²).

The spelling of 21135103 in words is "twenty-one million, one hundred thirty-five thousand, one hundred three".