21845523836 has 12 divisors (see below), whose sum is σ = 38659214160. Its totient is φ = 10800034080.

The previous prime is 21845523811. The next prime is 21845523841. The reversal of 21845523836 is 63832554812.

It is a congruent number.

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, 30681560 + ... + 30682271.

It is an arithmetic number, because the mean of its divisors is an integer number (3221601180).

Almost surely, 2^21845523836 is an apocalyptic number.

It is an amenable number.

21845523836 is a deficient number, since it is larger than the sum of its proper divisors (16813690324).

21845523836 is a wasteful number, since it uses less digits than its factorization.

21845523836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61363924 (or 61363922 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 47.

The spelling of 21845523836 in words is "twenty-one billion, eight hundred forty-five million, five hundred twenty-three thousand, eight hundred thirty-six".