21916783667 has 4 divisors (see below), whose sum is σ = 21917202120. Its totient is φ = 21916365216.

The previous prime is 21916783661. The next prime is 21916783687. The reversal of 21916783667 is 76638761912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21916783667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21916783661) 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, 117158 + ... + 239915.

It is an arithmetic number, because the mean of its divisors is an integer number (5479300530).

Almost surely, 2^21916783667 is an apocalyptic number.

21916783667 is a deficient number, since it is larger than the sum of its proper divisors (418453).

21916783667 is an equidigital number, since it uses as much as digits as its factorization.

21916783667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418452.

The product of its digits is 4572288, while the sum is 56.

The spelling of 21916783667 in words is "twenty-one billion, nine hundred sixteen million, seven hundred eighty-three thousand, six hundred sixty-seven".