21844533544811 has 4 divisors (see below), whose sum is σ = 21844557979992. Its totient is φ = 21844509109632.

The previous prime is 21844533544793. The next prime is 21844533544859. The reversal of 21844533544811 is 11844533544812.

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-21844533544811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21844533594811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10823606 + ... + 12682251.

It is an arithmetic number, because the mean of its divisors is an integer number (5461139494998).

Almost surely, 2^{21844533544811} is an apocalyptic number.

21844533544811 is a deficient number, since it is larger than the sum of its proper divisors (24435181).

21844533544811 is an equidigital number, since it uses as much as digits as its factorization.

21844533544811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24435180.

The product of its digits is 7372800, while the sum is 53.

Subtracting from 21844533544811 its reverse (11844533544812), we obtain a palindrome (9999999999999).

The spelling of 21844533544811 in words is "twenty-one trillion, eight hundred forty-four billion, five hundred thirty-three million, five hundred forty-four thousand, eight hundred eleven".