21323795840255 has 4 divisors (see below), whose sum is σ = 25588555008312. Its totient is φ = 17059036672200.

The previous prime is 21323795840239. The next prime is 21323795840267. The reversal of 21323795840255 is 55204859732312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21323795840255 - 2⁴ = 21323795840239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21323795840255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2132379584021 + ... + 2132379584030.

It is an arithmetic number, because the mean of its divisors is an integer number (6397138752078).

Almost surely, 2^{21323795840255} is an apocalyptic number.

21323795840255 is a deficient number, since it is larger than the sum of its proper divisors (4264759168057).

21323795840255 is an equidigital number, since it uses as much as digits as its factorization.

21323795840255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264759168056.

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 21323795840255 in words is "twenty-one trillion, three hundred twenty-three billion, seven hundred ninety-five million, eight hundred forty thousand, two hundred fifty-five".