21342017 has 8 divisors (see below), whose sum is σ = 21975072. Its totient is φ = 20714400.

The previous prime is 21342001. The next prime is 21342023. The reversal of 21342017 is 71024312.

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 21342017 - 2⁴ = 21342001 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 21342017.

It is not an unprimeable number, because it can be changed into a prime (21342047) 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, 7418 + ... + 9884.

It is an arithmetic number, because the mean of its divisors is an integer number (2746884).

Almost surely, 2^21342017 is an apocalyptic number.

It is an amenable number.

21342017 is a deficient number, since it is larger than the sum of its proper divisors (633055).

21342017 is a wasteful number, since it uses less digits than its factorization.

21342017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719.

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

The square root of 21342017 is about 4619.7420923684. The cubic root of 21342017 is about 277.3821353742.

Adding to 21342017 its reverse (71024312), we get a palindrome (92366329).

The spelling of 21342017 in words is "twenty-one million, three hundred forty-two thousand, seventeen".