21115456688 has 20 divisors (see below), whose sum is σ = 40971648480. Its totient is φ = 10542128064.

The previous prime is 21115456673. The next prime is 21115456697. The reversal of 21115456688 is 88665451112.

It is a super-2 number, since 2×21115456688² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 963848 + ... + 985511.

It is an arithmetic number, because the mean of its divisors is an integer number (2048582424).

Almost surely, 2^21115456688 is an apocalyptic number.

It is an amenable number.

21115456688 is a deficient number, since it is larger than the sum of its proper divisors (19856191792).

21115456688 is a wasteful number, since it uses less digits than its factorization.

21115456688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950044 (or 1950038 counting only the distinct ones).

The product of its digits is 460800, while the sum is 47.

The spelling of 21115456688 in words is "twenty-one billion, one hundred fifteen million, four hundred fifty-six thousand, six hundred eighty-eight".