21324017 has 8 divisors (see below), whose sum is σ = 25052160. Its totient is φ = 17894160.

The previous prime is 21324011. The next prime is 21324031. The reversal of 21324017 is 71042312.

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 21324017 - 2⁸ = 21323761 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 21324017.

It is not an unprimeable number, because it can be changed into a prime (21324011) 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, 74417 + ... + 74702.

It is an arithmetic number, because the mean of its divisors is an integer number (3131520).

Almost surely, 2^21324017 is an apocalyptic number.

It is an amenable number.

21324017 is a deficient number, since it is larger than the sum of its proper divisors (3728143).

21324017 is a wasteful number, since it uses less digits than its factorization.

21324017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149143.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21324017 is about 4617.7935207196. The cubic root of 21324017 is about 277.3041314572.

Adding to 21324017 its reverse (71042312), we get a palindrome (92366329).

The spelling of 21324017 in words is "twenty-one million, three hundred twenty-four thousand, seventeen".