21717172024 has 8 divisors (see below), whose sum is σ = 40719697560. Its totient is φ = 10858586008.

The previous prime is 21717172021. The next prime is 21717172031. The reversal of 21717172024 is 42027171712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21717172021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1357323244 + ... + 1357323259.

It is an arithmetic number, because the mean of its divisors is an integer number (5089962195).

Almost surely, 2^21717172024 is an apocalyptic number.

It is an amenable number.

21717172024 is a deficient number, since it is larger than the sum of its proper divisors (19002525536).

21717172024 is a wasteful number, since it uses less digits than its factorization.

21717172024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2714646509 (or 2714646505 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 34.

The spelling of 21717172024 in words is "twenty-one billion, seven hundred seventeen million, one hundred seventy-two thousand, twenty-four".