21600117 has 48 divisors (see below), whose sum is σ = 39536640. Its totient is φ = 11037600.

The previous prime is 21600091. The next prime is 21600121. The reversal of 21600117 is 71100612.

It is not a de Polignac number, because 21600117 - 2⁸ = 21599861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21600117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600167) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48984 + ... + 49422.

It is an arithmetic number, because the mean of its divisors is an integer number (823680).

Almost surely, 2^21600117 is an apocalyptic number.

It is an amenable number.

21600117 is a deficient number, since it is larger than the sum of its proper divisors (17936523).

21600117 is a wasteful number, since it uses less digits than its factorization.

21600117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 21600117 is about 4647.5926026277. The cubic root of 21600117 is about 278.4958328546.

Adding to 21600117 its reverse (71100612), we get a palindrome (92700729).

The spelling of 21600117 in words is "twenty-one million, six hundred thousand, one hundred seventeen".