21683598071 has 4 divisors (see below), whose sum is σ = 21702438144. Its totient is φ = 21664758000.

The previous prime is 21683598061. The next prime is 21683598119. The reversal of 21683598071 is 17089538612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21683598071 - 2³⁰ = 20609856247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683598011) 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 3 ways as a sum of consecutive naturals, for example, 9418310 + ... + 9420611.

It is an arithmetic number, because the mean of its divisors is an integer number (5425609536).

Almost surely, 2^21683598071 is an apocalyptic number.

21683598071 is a deficient number, since it is larger than the sum of its proper divisors (18840073).

21683598071 is a wasteful number, since it uses less digits than its factorization.

21683598071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18840072.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 21683598071 in words is "twenty-one billion, six hundred eighty-three million, five hundred ninety-eight thousand, seventy-one".