21853448879 has 2 divisors, whose sum is σ = 21853448880. Its totient is φ = 21853448878.

The previous prime is 21853448867. The next prime is 21853448989. The reversal of 21853448879 is 97884435812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21853448879 - 2⁸ = 21853448623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21853448179) 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 as a sum of consecutive naturals, namely, 10926724439 + 10926724440.

It is an arithmetic number, because the mean of its divisors is an integer number (10926724440).

Almost surely, 2^21853448879 is an apocalyptic number.

21853448879 is a deficient number, since it is larger than the sum of its proper divisors (1).

21853448879 is an equidigital number, since it uses as much as digits as its factorization.

21853448879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15482880, while the sum is 59.

The spelling of 21853448879 in words is "twenty-one billion, eight hundred fifty-three million, four hundred forty-eight thousand, eight hundred seventy-nine".