21568034705 has 16 divisors (see below), whose sum is σ = 30533182464. Its totient is φ = 14312427840.

The previous prime is 21568034693. The next prime is 21568034731. The reversal of 21568034705 is 50743086512.

It is not a de Polignac number, because 21568034705 - 2⁴ = 21568034689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9938102 + ... + 9940271.

It is an arithmetic number, because the mean of its divisors is an integer number (1908323904).

Almost surely, 2^21568034705 is an apocalyptic number.

It is an amenable number.

21568034705 is a deficient number, since it is larger than the sum of its proper divisors (8965147759).

21568034705 is a wasteful number, since it uses less digits than its factorization.

21568034705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19878416.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 21568034705 in words is "twenty-one billion, five hundred sixty-eight million, thirty-four thousand, seven hundred five".