21943586871 has 24 divisors (see below), whose sum is σ = 32728350720. Its totient is φ = 14153000400.

The previous prime is 21943586867. The next prime is 21943586897. The reversal of 21943586871 is 17868534912.

21943586871 is a `hidden beast` number, since 2 + 19 + 43 + 586 + 8 + 7 + 1 = 666.

It is not a de Polignac number, because 21943586871 - 2² = 21943586867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943586831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1150906 + ... + 1169816.

It is an arithmetic number, because the mean of its divisors is an integer number (1363681280).

Almost surely, 2^21943586871 is an apocalyptic number.

21943586871 is a deficient number, since it is larger than the sum of its proper divisors (10784763849).

21943586871 is a wasteful number, since it uses less digits than its factorization.

21943586871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23107 (or 23104 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 21943586871 in words is "twenty-one billion, nine hundred forty-three million, five hundred eighty-six thousand, eight hundred seventy-one".