21717347258 has 8 divisors (see below), whose sum is σ = 32586651552. Its totient is φ = 10855130076.

The previous prime is 21717347243. The next prime is 21717347273. The reversal of 21717347258 is 85274371712.

It is an interprime number because it is at equal distance from previous prime (21717347243) and next prime (21717347273).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1764110 + ... + 1776377.

It is an arithmetic number, because the mean of its divisors is an integer number (4073331444).

Almost surely, 2^21717347258 is an apocalyptic number.

21717347258 is a deficient number, since it is larger than the sum of its proper divisors (10869304294).

21717347258 is a wasteful number, since it uses less digits than its factorization.

21717347258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3543556.

The product of its digits is 658560, while the sum is 47.

The spelling of 21717347258 in words is "twenty-one billion, seven hundred seventeen million, three hundred forty-seven thousand, two hundred fifty-eight".