21600000017 has 2 divisors, whose sum is σ = 21600000018. Its totient is φ = 21600000016.

The previous prime is 21599999969. The next prime is 21600000041. The reversal of 21600000017 is 71000000612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15966596881 + 5633403136 = 126359^2 + 75056^2 .

It is a cyclic number.

It is not a de Polignac number, because 21600000017 - 2²² = 21595805713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21599999950 and 21600000004.

It is not a weakly prime, because it can be changed into another prime (21600000047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800000008 + 10800000009.

It is an arithmetic number, because the mean of its divisors is an integer number (10800000009).

Almost surely, 2^21600000017 is an apocalyptic number.

It is an amenable number.

21600000017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21600000017 is an equidigital number, since it uses as much as digits as its factorization.

21600000017 is an evil number, because the sum of its binary digits is even.

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

Adding to 21600000017 its reverse (71000000612), we get a palindrome (92600000629).

The spelling of 21600000017 in words is "twenty-one billion, six hundred million, seventeen", and thus it is an aban number.