21716027 has 8 divisors (see below), whose sum is σ = 22471680. Its totient is φ = 20963880.

The previous prime is 21716017. The next prime is 21716029. The reversal of 21716027 is 72061712.

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

It is a cyclic number.

It is not a de Polignac number, because 21716027 - 2¹⁰ = 21715003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21715987 and 21716005.

It is not an unprimeable number, because it can be changed into a prime (21716029) 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, 19898 + ... + 20960.

It is an arithmetic number, because the mean of its divisors is an integer number (2808960).

Almost surely, 2^21716027 is an apocalyptic number.

21716027 is a deficient number, since it is larger than the sum of its proper divisors (755653).

21716027 is a wasteful number, since it uses less digits than its factorization.

21716027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 21716027 is about 4660.0458152254. The cubic root of 21716027 is about 278.9930968689.

Adding to 21716027 its reverse (72061712), we get a palindrome (93777739).

The spelling of 21716027 in words is "twenty-one million, seven hundred sixteen thousand, twenty-seven".