21844044813 has 8 divisors (see below), whose sum is σ = 29535610176. Its totient is φ = 14357588000.

The previous prime is 21844044799. The next prime is 21844044823. The reversal of 21844044813 is 31844044812.

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 21844044813 - 2⁸ = 21844044557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21844044823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51276888 + ... + 51277313.

It is an arithmetic number, because the mean of its divisors is an integer number (3691951272).

Almost surely, 2^21844044813 is an apocalyptic number.

It is an amenable number.

21844044813 is a deficient number, since it is larger than the sum of its proper divisors (7691565363).

21844044813 is a wasteful number, since it uses less digits than its factorization.

21844044813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102554275.

The product of its (nonzero) digits is 98304, while the sum is 39.

Subtracting 21844044813 from its reverse (31844044812), we obtain a palindrome (9999999999).

The spelling of 21844044813 in words is "twenty-one billion, eight hundred forty-four million, forty-four thousand, eight hundred thirteen".