21716103 has 4 divisors (see below), whose sum is σ = 28954808. Its totient is φ = 14477400.

The previous prime is 21716087. The next prime is 21716137. The reversal of 21716103 is 30161712.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21716103 - 2⁴ = 21716087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21716103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716143) 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 3 ways as a sum of consecutive naturals, for example, 3619348 + ... + 3619353.

It is an arithmetic number, because the mean of its divisors is an integer number (7238702).

Almost surely, 2^21716103 is an apocalyptic number.

21716103 is a deficient number, since it is larger than the sum of its proper divisors (7238705).

21716103 is an equidigital number, since it uses as much as digits as its factorization.

21716103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7238704.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21716103 is about 4660.0539696446. The cubic root of 21716103 is about 278.9934223344.

Adding to 21716103 its reverse (30161712), we get a palindrome (51877815).

The spelling of 21716103 in words is "twenty-one million, seven hundred sixteen thousand, one hundred three".