21716026 has 8 divisors (see below), whose sum is σ = 32596704. Its totient is φ = 10850460.

The previous prime is 21716017. The next prime is 21716029. The reversal of 21716026 is 62061712.

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

It is not an unprimeable number, because it can be changed into a prime (21716029) 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, 1051 + ... + 6673.

It is an arithmetic number, because the mean of its divisors is an integer number (4074588).

Almost surely, 2^21716026 is an apocalyptic number.

21716026 is a deficient number, since it is larger than the sum of its proper divisors (10880678).

21716026 is a wasteful number, since it uses less digits than its factorization.

21716026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7556.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21716026 is about 4660.0457079303. The cubic root of 21716026 is about 278.9930925864.

Adding to 21716026 its reverse (62061712), we get a palindrome (83777738).

The spelling of 21716026 in words is "twenty-one million, seven hundred sixteen thousand, twenty-six".