21982654871 has 4 divisors (see below), whose sum is σ = 21982973544. Its totient is φ = 21982336200.

The previous prime is 21982654861. The next prime is 21982654901. The reversal of 21982654871 is 17845628912.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21982654871 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 (21982654861) 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 3 ways as a sum of consecutive naturals, for example, 7865 + ... + 209826.

It is an arithmetic number, because the mean of its divisors is an integer number (5495743386).

Almost surely, 2^21982654871 is an apocalyptic number.

21982654871 is a deficient number, since it is larger than the sum of its proper divisors (318673).

21982654871 is a wasteful number, since it uses less digits than its factorization.

21982654871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318672.

The product of its digits is 1935360, while the sum is 53.

The spelling of 21982654871 in words is "twenty-one billion, nine hundred eighty-two million, six hundred fifty-four thousand, eight hundred seventy-one".