21267317 has 8 divisors (see below), whose sum is σ = 21832800. Its totient is φ = 20708784.

The previous prime is 21267263. The next prime is 21267371. The reversal of 21267317 is 71376212.

It is an interprime number because it is at equal distance from previous prime (21267263) and next prime (21267371).

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 21267317 - 2¹⁰ = 21266293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21267317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21266317) 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 7 ways as a sum of consecutive naturals, for example, 4778 + ... + 8084.

It is an arithmetic number, because the mean of its divisors is an integer number (2729100).

Almost surely, 2^21267317 is an apocalyptic number.

It is an amenable number.

21267317 is a deficient number, since it is larger than the sum of its proper divisors (565483).

21267317 is a wasteful number, since it uses less digits than its factorization.

21267317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3475.

The product of its digits is 3528, while the sum is 29.

The square root of 21267317 is about 4611.6501385079. The cubic root of 21267317 is about 277.0581318302.

The spelling of 21267317 in words is "twenty-one million, two hundred sixty-seven thousand, three hundred seventeen".