21717432344 has 16 divisors (see below), whose sum is σ = 40727789520. Its totient is φ = 10856688480.

The previous prime is 21717432337. The next prime is 21717432377. The reversal of 21717432344 is 44323471712.

It is a junction number, because it is equal to n+sod(n) for n = 21717432298 and 21717432307.

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, 207452 + ... + 294059.

It is an arithmetic number, because the mean of its divisors is an integer number (2545486845).

Almost surely, 2^21717432344 is an apocalyptic number.

It is an amenable number.

21717432344 is a deficient number, since it is larger than the sum of its proper divisors (19010357176).

21717432344 is a wasteful number, since it uses less digits than its factorization.

21717432344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506930 (or 506926 counting only the distinct ones).

The product of its digits is 112896, while the sum is 38.

The spelling of 21717432344 in words is "twenty-one billion, seven hundred seventeen million, four hundred thirty-two thousand, three hundred forty-four".