21606135232163 has 8 divisors (see below), whose sum is σ = 21619012462800. Its totient is φ = 21593258588160.

The previous prime is 21606135232093. The next prime is 21606135232183. The reversal of 21606135232163 is 36123253160612.

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 21606135232163 - 2³² = 21601840264867 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 21606135232163.

It is not an unprimeable number, because it can be changed into a prime (21606135232183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89887163 + ... + 90127211.

It is an arithmetic number, because the mean of its divisors is an integer number (2702376557850).

Almost surely, 2^{21606135232163} is an apocalyptic number.

21606135232163 is a deficient number, since it is larger than the sum of its proper divisors (12877230637).

21606135232163 is a wasteful number, since it uses less digits than its factorization.

21606135232163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293317.

The product of its (nonzero) digits is 233280, while the sum is 41.

Adding to 21606135232163 its reverse (36123253160612), we get a palindrome (57729388392775).

The spelling of 21606135232163 in words is "twenty-one trillion, six hundred six billion, one hundred thirty-five million, two hundred thirty-two thousand, one hundred sixty-three".