21616568411 has 8 divisors (see below), whose sum is σ = 21644470080. Its totient is φ = 21588686728.

The previous prime is 21616568401. The next prime is 21616568431. The reversal of 21616568411 is 11486561612.

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 21616568411 - 2¹⁸ = 21616306267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21616568401) 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, 3681500 + ... + 3687366.

It is an arithmetic number, because the mean of its divisors is an integer number (2705558760).

Almost surely, 2^21616568411 is an apocalyptic number.

21616568411 is a deficient number, since it is larger than the sum of its proper divisors (27901669).

21616568411 is a wasteful number, since it uses less digits than its factorization.

21616568411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9993.

The product of its digits is 69120, while the sum is 41.

The spelling of 21616568411 in words is "twenty-one billion, six hundred sixteen million, five hundred sixty-eight thousand, four hundred eleven".