21724112707 has 32 divisors (see below), whose sum is σ = 25517099520. Its totient is φ = 18284497920.

The previous prime is 21724112701. The next prime is 21724112731. The reversal of 21724112707 is 70721142712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21724112707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21724112701) 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 in 31 ways as a sum of consecutive naturals, for example, 2909523 + ... + 2916979.

It is an arithmetic number, because the mean of its divisors is an integer number (797409360).

Almost surely, 2^21724112707 is an apocalyptic number.

21724112707 is a deficient number, since it is larger than the sum of its proper divisors (3792986813).

21724112707 is a wasteful number, since it uses less digits than its factorization.

21724112707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7803.

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

It can be divided in two parts, 21724 and 112707, that added together give a palindrome (134431).

The spelling of 21724112707 in words is "twenty-one billion, seven hundred twenty-four million, one hundred twelve thousand, seven hundred seven".