21711859713 has 6 divisors (see below), whose sum is σ = 31361575154. Its totient is φ = 14474573136.

The previous prime is 21711859661. The next prime is 21711859727. The reversal of 21711859713 is 31795811712.

It can be written as a sum of positive squares in only one way, i.e., 11884706289 + 9827153424 = 109017^2 + 99132^2 .

It is not a de Polignac number, because 21711859713 - 2⁶ = 21711859649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21711859733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1206214420 + ... + 1206214437.

Almost surely, 2^21711859713 is an apocalyptic number.

It is an amenable number.

21711859713 is a deficient number, since it is larger than the sum of its proper divisors (9649715441).

21711859713 is a wasteful number, since it uses less digits than its factorization.

21711859713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412428863 (or 2412428860 counting only the distinct ones).

The product of its digits is 105840, while the sum is 45.

The spelling of 21711859713 in words is "twenty-one billion, seven hundred eleven million, eight hundred fifty-nine thousand, seven hundred thirteen".