21888856857056 has 48 divisors (see below), whose sum is σ = 49269387888000. Its totient is φ = 9377231994240.

The previous prime is 21888856857031. The next prime is 21888856857113. The reversal of 21888856857056 is 65075865888812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18737306 + ... + 19871193.

It is an arithmetic number, because the mean of its divisors is an integer number (1026445581000).

Almost surely, 2^{21888856857056} is an apocalyptic number.

It is an amenable number.

21888856857056 is an abundant number, since it is smaller than the sum of its proper divisors (27380531030944).

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

21888856857056 is a wasteful number, since it uses less digits than its factorization.

21888856857056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38611047 (or 38611039 counting only the distinct ones).

The product of its (nonzero) digits is 2064384000, while the sum is 77.

The spelling of 21888856857056 in words is "twenty-one trillion, eight hundred eighty-eight billion, eight hundred fifty-six million, eight hundred fifty-seven thousand, fifty-six".