21175423713 has 12 divisors (see below), whose sum is σ = 31413391828. Its totient is φ = 13735409760.

The previous prime is 21175423699. The next prime is 21175423723. The reversal of 21175423713 is 31732457112.

21175423713 is a `hidden beast` number, since 211 + 7 + 5 + 423 + 7 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16566778944 + 4608644769 = 128712^2 + 67887^2 .

It is not a de Polignac number, because 21175423713 - 2⁸ = 21175423457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21175423723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31794598 + ... + 31795263.

Almost surely, 2^21175423713 is an apocalyptic number.

It is an amenable number.

21175423713 is a deficient number, since it is larger than the sum of its proper divisors (10237968115).

21175423713 is a wasteful number, since it uses less digits than its factorization.

21175423713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63589904 (or 63589901 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The spelling of 21175423713 in words is "twenty-one billion, one hundred seventy-five million, four hundred twenty-three thousand, seven hundred thirteen".