21536832556 has 12 divisors (see below), whose sum is σ = 37691269168. Its totient is φ = 10767898512.

The previous prime is 21536832547. The next prime is 21536832601. The reversal of 21536832556 is 65523863512.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 26811 + ... + 209266.

Almost surely, 2^21536832556 is an apocalyptic number.

It is an amenable number.

21536832556 is a deficient number, since it is larger than the sum of its proper divisors (16154436612).

21536832556 is a wasteful number, since it uses less digits than its factorization.

21536832556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258888 (or 258886 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 46.

The spelling of 21536832556 in words is "twenty-one billion, five hundred thirty-six million, eight hundred thirty-two thousand, five hundred fifty-six".