21724717346 has 8 divisors (see below), whose sum is σ = 32588848044. Its totient is φ = 10861768000.

The previous prime is 21724717271. The next prime is 21724717393. The reversal of 21724717346 is 64371742712.

It can be written as a sum of positive squares in 2 ways, for example, as 21167049121 + 557668225 = 145489^2 + 23615^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21724717297 and 21724717306.

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, 247835 + ... + 323838.

Almost surely, 2^21724717346 is an apocalyptic number.

21724717346 is a deficient number, since it is larger than the sum of its proper divisors (10864130698).

21724717346 is a wasteful number, since it uses less digits than its factorization.

21724717346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590676.

The product of its digits is 395136, while the sum is 44.

The spelling of 21724717346 in words is "twenty-one billion, seven hundred twenty-four million, seven hundred seventeen thousand, three hundred forty-six".