21544276317 has 8 divisors (see below), whose sum is σ = 28951888896. Its totient is φ = 14249757312.

The previous prime is 21544276289. The next prime is 21544276319. The reversal of 21544276317 is 71367244512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21544276317 - 2⁶ = 21544276253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544276319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28272948 + ... + 28273709.

It is an arithmetic number, because the mean of its divisors is an integer number (3618986112).

Almost surely, 2^21544276317 is an apocalyptic number.

It is an amenable number.

21544276317 is a deficient number, since it is larger than the sum of its proper divisors (7407612579).

21544276317 is a wasteful number, since it uses less digits than its factorization.

21544276317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56546787.

The product of its digits is 282240, while the sum is 42.

The spelling of 21544276317 in words is "twenty-one billion, five hundred forty-four million, two hundred seventy-six thousand, three hundred seventeen".