21841548243839 has 4 divisors (see below), whose sum is σ = 21841585139280. Its totient is φ = 21841511348400.

The previous prime is 21841548243829. The next prime is 21841548243883. The reversal of 21841548243839 is 93834284514812.

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 21841548243839 - 2⁸ = 21841548243583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841548243829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17545019 + ... + 18748620.

It is an arithmetic number, because the mean of its divisors is an integer number (5460396284820).

Almost surely, 2^{21841548243839} is an apocalyptic number.

21841548243839 is a deficient number, since it is larger than the sum of its proper divisors (36895441).

21841548243839 is an equidigital number, since it uses as much as digits as its factorization.

21841548243839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36895440.

The product of its digits is 53084160, while the sum is 62.

The spelling of 21841548243839 in words is "twenty-one trillion, eight hundred forty-one billion, five hundred forty-eight million, two hundred forty-three thousand, eight hundred thirty-nine".