21120816659848 has 32 divisors (see below), whose sum is σ = 39615137631360. Its totient is φ = 10556780414400.

The previous prime is 21120816659827. The next prime is 21120816659851. The reversal of 21120816659848 is 84895661802112.

It is a happy 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, 752929423 + ... + 752957473.

It is an arithmetic number, because the mean of its divisors is an integer number (1237973050980).

Almost surely, 2^{21120816659848} is an apocalyptic number.

It is an amenable number.

21120816659848 is a deficient number, since it is larger than the sum of its proper divisors (18494320971512).

21120816659848 is a wasteful number, since it uses less digits than its factorization.

21120816659848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57037 (or 57033 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 61.

The spelling of 21120816659848 in words is "twenty-one trillion, one hundred twenty billion, eight hundred sixteen million, six hundred fifty-nine thousand, eight hundred forty-eight".