21647130061688 has 16 divisors (see below), whose sum is σ = 42975919975680. Its totient is φ = 10186884734848.

The previous prime is 21647130061673. The next prime is 21647130061717. The reversal of 21647130061688 is 88616003174612.

It is a congruent number.

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, 79585036856 + ... + 79585037127.

It is an arithmetic number, because the mean of its divisors is an integer number (2685994998480).

Almost surely, 2^{21647130061688} is an apocalyptic number.

It is an amenable number.

21647130061688 is a deficient number, since it is larger than the sum of its proper divisors (21328789913992).

21647130061688 is a wasteful number, since it uses less digits than its factorization.

21647130061688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159170074006 (or 159170074002 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 21647130061688 in words is "twenty-one trillion, six hundred forty-seven billion, one hundred thirty million, sixty-one thousand, six hundred eighty-eight".