21301217 has 8 divisors (see below), whose sum is σ = 24471936. Its totient is φ = 18162432.

The previous prime is 21301201. The next prime is 21301219. The reversal of 21301217 is 71210312.

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 21301217 - 2⁴ = 21301201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21301195 and 21301204.

It is not an unprimeable number, because it can be changed into a prime (21301219) 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, 6533 + ... + 9234.

It is an arithmetic number, because the mean of its divisors is an integer number (3058992).

Almost surely, 2^21301217 is an apocalyptic number.

It is an amenable number.

21301217 is a deficient number, since it is larger than the sum of its proper divisors (3170719).

21301217 is a wasteful number, since it uses less digits than its factorization.

21301217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15967.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21301217 is about 4615.3241489629. The cubic root of 21301217 is about 277.2052634543.

Adding to 21301217 its reverse (71210312), we get a palindrome (92511529).

The spelling of 21301217 in words is "twenty-one million, three hundred one thousand, two hundred seventeen".