21035103 has 16 divisors (see below), whose sum is σ = 29823840. Its totient is φ = 13142016.

The previous prime is 21035059. The next prime is 21035111. The reversal of 21035103 is 30153012.

It is a happy number.

It is not a de Polignac number, because 21035103 - 2⁸ = 21034847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035123) 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 15 ways as a sum of consecutive naturals, for example, 13383 + ... + 14871.

It is an arithmetic number, because the mean of its divisors is an integer number (1863990).

Almost surely, 2^21035103 is an apocalyptic number.

21035103 is a deficient number, since it is larger than the sum of its proper divisors (8788737).

21035103 is a wasteful number, since it uses less digits than its factorization.

21035103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 21035103 is about 4586.4041470416. The cubic root of 21035103 is about 276.0460566912.

Adding to 21035103 its reverse (30153012), we get a palindrome (51188115).

The spelling of 21035103 in words is "twenty-one million, thirty-five thousand, one hundred three".