21612305163 has 8 divisors (see below), whose sum is σ = 29304820800. Its totient is φ = 14163996488.

The previous prime is 21612305159. The next prime is 21612305191. The reversal of 21612305163 is 36150321612.

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 21612305163 - 2² = 21612305159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21612305163.

It is not an unprimeable number, because it can be changed into a prime (21612305153) 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, 61051533 + ... + 61051886.

It is an arithmetic number, because the mean of its divisors is an integer number (3663102600).

Almost surely, 2^21612305163 is an apocalyptic number.

21612305163 is a deficient number, since it is larger than the sum of its proper divisors (7692515637).

21612305163 is a wasteful number, since it uses less digits than its factorization.

21612305163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122103481.

The product of its (nonzero) digits is 6480, while the sum is 30.

Adding to 21612305163 its reverse (36150321612), we get a palindrome (57762626775).

The spelling of 21612305163 in words is "twenty-one billion, six hundred twelve million, three hundred five thousand, one hundred sixty-three".