21717353792688 has 40 divisors (see below), whose sum is σ = 56110906434048. Its totient is φ = 7238118902592.

The previous prime is 21717353792671. The next prime is 21717353792699. The reversal of 21717353792688 is 88629735371712.

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, 30868156 + ... + 31563867.

Almost surely, 2^{21717353792688} is an apocalyptic number.

It is an amenable number.

21717353792688 is an abundant number, since it is smaller than the sum of its proper divisors (34393552641360).

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

21717353792688 is a wasteful number, since it uses less digits than its factorization.

21717353792688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62439281 (or 62439275 counting only the distinct ones).

The product of its digits is 213373440, while the sum is 69.

The spelling of 21717353792688 in words is "twenty-one trillion, seven hundred seventeen billion, three hundred fifty-three million, seven hundred ninety-two thousand, six hundred eighty-eight".