21960508729 has 8 divisors (see below), whose sum is σ = 22295725760. Its totient is φ = 21625510896.

The previous prime is 21960508723. The next prime is 21960508733. The reversal of 21960508729 is 92780506912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21960508729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21960508723) 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, 153067 + ... + 259519.

It is an arithmetic number, because the mean of its divisors is an integer number (2786965720).

Almost surely, 2^21960508729 is an apocalyptic number.

It is an amenable number.

21960508729 is a deficient number, since it is larger than the sum of its proper divisors (335217031).

21960508729 is a wasteful number, since it uses less digits than its factorization.

21960508729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109599.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 21960508729 in words is "twenty-one billion, nine hundred sixty million, five hundred eight thousand, seven hundred twenty-nine".