21300417 has 12 divisors (see below), whose sum is σ = 30890340. Its totient is φ = 14143488.

The previous prime is 21300403. The next prime is 21300421. The reversal of 21300417 is 71400312.

It can be written as a sum of positive squares in 2 ways, for example, as 13549761 + 7750656 = 3681^2 + 2784^2 .

It is not a de Polignac number, because 21300417 - 2⁴ = 21300401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21300417.

It is not an unprimeable number, because it can be changed into a prime (21300467) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2292 + ... + 6917.

It is an arithmetic number, because the mean of its divisors is an integer number (2574195).

Almost surely, 2^21300417 is an apocalyptic number.

It is an amenable number.

21300417 is a deficient number, since it is larger than the sum of its proper divisors (9589923).

21300417 is a wasteful number, since it uses less digits than its factorization.

21300417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9472 (or 9469 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21300417 is about 4615.2374803470. The cubic root of 21300417 is about 277.2017931207.

Adding to 21300417 its reverse (71400312), we get a palindrome (92700729).

The spelling of 21300417 in words is "twenty-one million, three hundred thousand, four hundred seventeen".