21745982705 has 8 divisors (see below), whose sum is σ = 26226312000. Its totient is φ = 17309364336.

The previous prime is 21745982693. The next prime is 21745982711. The reversal of 21745982705 is 50728954712.

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

It is a cyclic number.

It is not a de Polignac number, because 21745982705 - 2⁴ = 21745982689 is a prime.

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, 10926635 + ... + 10928624.

It is an arithmetic number, because the mean of its divisors is an integer number (3278289000).

Almost surely, 2^21745982705 is an apocalyptic number.

It is an amenable number.

21745982705 is a deficient number, since it is larger than the sum of its proper divisors (4480329295).

21745982705 is a wasteful number, since it uses less digits than its factorization.

21745982705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21855463.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 21745982705 in words is "twenty-one billion, seven hundred forty-five million, nine hundred eighty-two thousand, seven hundred five".