21886768867 has 4 divisors (see below), whose sum is σ = 21887102880. Its totient is φ = 21886434856.

The previous prime is 21886768861. The next prime is 21886768919. The reversal of 21886768867 is 76886768812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21886768867 - 2¹⁵ = 21886736099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21886768861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32728 + ... + 211765.

It is an arithmetic number, because the mean of its divisors is an integer number (5471775720).

Almost surely, 2^21886768867 is an apocalyptic number.

21886768867 is a deficient number, since it is larger than the sum of its proper divisors (334013).

21886768867 is an equidigital number, since it uses as much as digits as its factorization.

21886768867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334012.

The product of its digits is 86704128, while the sum is 67.

Subtracting 21886768867 from its reverse (76886768812), we obtain a palindrome (54999999945).

The spelling of 21886768867 in words is "twenty-one billion, eight hundred eighty-six million, seven hundred sixty-eight thousand, eight hundred sixty-seven".