21786843822 has 16 divisors (see below), whose sum is σ = 44063280720. Its totient is φ = 7180682432.

The previous prime is 21786843821. The next prime is 21786843823. The reversal of 21786843822 is 22834868712.

It is an interprime number because it is at equal distance from previous prime (21786843821) and next prime (21786843823).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21786843821) 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 7 ways as a sum of consecutive naturals, for example, 20399133 + ... + 20400200.

It is an arithmetic number, because the mean of its divisors is an integer number (2753955045).

Almost surely, 2^21786843822 is an apocalyptic number.

21786843822 is an abundant number, since it is smaller than the sum of its proper divisors (22276436898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21786843822 is a wasteful number, since it uses less digits than its factorization.

21786843822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40799427.

The product of its digits is 2064384, while the sum is 51.

The spelling of 21786843822 in words is "twenty-one billion, seven hundred eighty-six million, eight hundred forty-three thousand, eight hundred twenty-two".