21496040056 has 16 divisors (see below), whose sum is σ = 40358049840. Its totient is φ = 10733893440.

The previous prime is 21496040047. The next prime is 21496040063. The reversal of 21496040056 is 65004069412.

It is a junction number, because it is equal to n+sod(n) for n = 21496039997 and 21496040024.

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 3 ways as a sum of consecutive naturals, for example, 1759356 + ... + 1771531.

It is an arithmetic number, because the mean of its divisors is an integer number (2522378115).

Almost surely, 2^21496040056 is an apocalyptic number.

It is an amenable number.

21496040056 is a deficient number, since it is larger than the sum of its proper divisors (18862009784).

21496040056 is a wasteful number, since it uses less digits than its factorization.

21496040056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531654 (or 3531650 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21496040056 in words is "twenty-one billion, four hundred ninety-six million, forty thousand, fifty-six".