21701113729 has 4 divisors (see below), whose sum is σ = 21903927984. Its totient is φ = 21498299476.

The previous prime is 21701113723. The next prime is 21701113741. The reversal of 21701113729 is 92731110712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21701113729 - 2²⁵ = 21667559297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21701113694 and 21701113703.

It is not an unprimeable number, because it can be changed into a prime (21701113723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101406967 + ... + 101407180.

It is an arithmetic number, because the mean of its divisors is an integer number (5475981996).

Almost surely, 2^21701113729 is an apocalyptic number.

It is an amenable number.

21701113729 is a deficient number, since it is larger than the sum of its proper divisors (202814255).

21701113729 is a wasteful number, since it uses less digits than its factorization.

21701113729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202814254.

The product of its (nonzero) digits is 5292, while the sum is 34.

The spelling of 21701113729 in words is "twenty-one billion, seven hundred one million, one hundred thirteen thousand, seven hundred twenty-nine".