21544116056 has 16 divisors (see below), whose sum is σ = 41254691040. Its totient is φ = 10542865120.

The previous prime is 21544116019. The next prime is 21544116073. The reversal of 21544116056 is 65061144512.

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, 28648715 + ... + 28649466.

It is an arithmetic number, because the mean of its divisors is an integer number (2578418190).

Almost surely, 2^21544116056 is an apocalyptic number.

It is an amenable number.

21544116056 is a deficient number, since it is larger than the sum of its proper divisors (19710574984).

21544116056 is a wasteful number, since it uses less digits than its factorization.

21544116056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57298234 (or 57298230 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 21544116056 in words is "twenty-one billion, five hundred forty-four million, one hundred sixteen thousand, fifty-six".