21710403 has 32 divisors (see below), whose sum is σ = 37793280. Its totient is φ = 12143520.

The previous prime is 21710389. The next prime is 21710417. The reversal of 21710403 is 30401712.

It is an interprime number because it is at equal distance from previous prime (21710389) and next prime (21710417).

It is not a de Polignac number, because 21710403 - 2⁵ = 21710371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21710203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1050 + ... + 6672.

It is an arithmetic number, because the mean of its divisors is an integer number (1181040).

Almost surely, 2^21710403 is an apocalyptic number.

21710403 is a deficient number, since it is larger than the sum of its proper divisors (16082877).

21710403 is a wasteful number, since it uses less digits than its factorization.

21710403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5656 (or 5650 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21710403 is about 4659.4423486078. The cubic root of 21710403 is about 278.9690103168.

The spelling of 21710403 in words is "twenty-one million, seven hundred ten thousand, four hundred three".