21716403 has 8 divisors (see below), whose sum is σ = 28981248. Its totient is φ = 14464584.

The previous prime is 21716381. The next prime is 21716407. The reversal of 21716403 is 30461712.

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

It is not a de Polignac number, because 21716403 - 2⁵ = 21716371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21716407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1726 + ... + 6812.

It is an arithmetic number, because the mean of its divisors is an integer number (3622656).

Almost surely, 2^21716403 is an apocalyptic number.

21716403 is a deficient number, since it is larger than the sum of its proper divisors (7264845).

21716403 is a wasteful number, since it uses less digits than its factorization.

21716403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6513.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21716403 is about 4660.0861580018. The cubic root of 21716403 is about 278.9947070591.

The spelling of 21716403 in words is "twenty-one million, seven hundred sixteen thousand, four hundred three".