21713103 has 10 divisors (see below), whose sum is σ = 32435744. Its totient is φ = 14475348.

The previous prime is 21713099. The next prime is 21713129. The reversal of 21713103 is 30131712.

It is not a de Polignac number, because 21713103 - 2² = 21713099 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 (21713183) 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 9 ways as a sum of consecutive naturals, for example, 133951 + ... + 134112.

Almost surely, 2^21713103 is an apocalyptic number.

21713103 is a deficient number, since it is larger than the sum of its proper divisors (10722641).

21713103 is an equidigital number, since it uses as much as digits as its factorization.

21713103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268075 (or 268066 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 21713103 is about 4659.7320738429. The cubic root of 21713103 is about 278.9805744366.

Adding to 21713103 its reverse (30131712), we get a palindrome (51844815).

The spelling of 21713103 in words is "twenty-one million, seven hundred thirteen thousand, one hundred three".