21704125071 has 8 divisors (see below), whose sum is σ = 28952937520. Its totient is φ = 14462364672.

The previous prime is 21704125057. The next prime is 21704125073. The reversal of 21704125071 is 17052140712.

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

It is a de Polignac number, because none of the positive numbers 2^k-21704125071 is a prime.

It is a super-2 number, since 2×21704125071² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21704125073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1755826 + ... + 1768143.

It is an arithmetic number, because the mean of its divisors is an integer number (3619117190).

Almost surely, 2^21704125071 is an apocalyptic number.

21704125071 is a deficient number, since it is larger than the sum of its proper divisors (7248812449).

21704125071 is a wasteful number, since it uses less digits than its factorization.

21704125071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526025.

The product of its (nonzero) digits is 3920, while the sum is 30.

Adding to 21704125071 its reverse (17052140712), we get a palindrome (38756265783).

The spelling of 21704125071 in words is "twenty-one billion, seven hundred four million, one hundred twenty-five thousand, seventy-one".