21966636624 has 40 divisors (see below), whose sum is σ = 56813313120. Its totient is φ = 7313674368.

The previous prime is 21966636607. The next prime is 21966636697. The reversal of 21966636624 is 42663666912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225147 + ... + 307610.

It is an arithmetic number, because the mean of its divisors is an integer number (1420332828).

Almost surely, 2^21966636624 is an apocalyptic number.

21966636624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21966636624 is an abundant number, since it is smaller than the sum of its proper divisors (34846676496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21966636624 is a wasteful number, since it uses less digits than its factorization.

21966636624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533627 (or 533621 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 51.

The spelling of 21966636624 in words is "twenty-one billion, nine hundred sixty-six million, six hundred thirty-six thousand, six hundred twenty-four".