21843905939317 has 16 divisors (see below), whose sum is σ = 27234345715200. Its totient is φ = 17020984742640.

The previous prime is 21843905939311. The next prime is 21843905939353. The reversal of 21843905939317 is 71393950934812.

It is a cyclic number.

It is not a de Polignac number, because 21843905939317 - 2⁷ = 21843905939189 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 (21843905939311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3575934 + ... + 7514992.

It is an arithmetic number, because the mean of its divisors is an integer number (1702146607200).

Almost surely, 2^{21843905939317} is an apocalyptic number.

It is an amenable number.

21843905939317 is a deficient number, since it is larger than the sum of its proper divisors (5390439775883).

21843905939317 is a wasteful number, since it uses less digits than its factorization.

21843905939317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4011096.

The product of its (nonzero) digits is 44089920, while the sum is 64.

The spelling of 21843905939317 in words is "twenty-one trillion, eight hundred forty-three billion, nine hundred five million, nine hundred thirty-nine thousand, three hundred seventeen".