21596543228 has 48 divisors (see below), whose sum is σ = 41229313440. Its totient is φ = 9838520064.

The previous prime is 21596543219. The next prime is 21596543233. The reversal of 21596543228 is 82234569512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7719926 + ... + 7722722.

It is an arithmetic number, because the mean of its divisors is an integer number (858944030).

Almost surely, 2^21596543228 is an apocalyptic number.

It is an amenable number.

21596543228 is a deficient number, since it is larger than the sum of its proper divisors (19632770212).

21596543228 is a wasteful number, since it uses less digits than its factorization.

21596543228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4686 (or 4684 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 47.

The spelling of 21596543228 in words is "twenty-one billion, five hundred ninety-six million, five hundred forty-three thousand, two hundred twenty-eight".