21847767871 has 8 divisors (see below), whose sum is σ = 21919531088. Its totient is φ = 21776040000.

The previous prime is 21847767859. The next prime is 21847767901. The reversal of 21847767871 is 17876774812.

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

It is a cyclic number.

It is not a de Polignac number, because 21847767871 - 2⁵ = 21847767839 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 (21847767811) 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, 1861321 + ... + 1873021.

It is an arithmetic number, because the mean of its divisors is an integer number (2739941386).

Almost surely, 2^21847767871 is an apocalyptic number.

21847767871 is a deficient number, since it is larger than the sum of its proper divisors (71763217).

21847767871 is a wasteful number, since it uses less digits than its factorization.

21847767871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17673.

The product of its digits is 7375872, while the sum is 58.

The spelling of 21847767871 in words is "twenty-one billion, eight hundred forty-seven million, seven hundred sixty-seven thousand, eight hundred seventy-one".