21698716726 has 8 divisors (see below), whose sum is σ = 32940220824. Its totient is φ = 10718643120.

The previous prime is 21698716723. The next prime is 21698716727. The reversal of 21698716726 is 62761789612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21698716723) 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, 65357415 + ... + 65357746.

It is an arithmetic number, because the mean of its divisors is an integer number (4117527603).

Almost surely, 2^21698716726 is an apocalyptic number.

21698716726 is a deficient number, since it is larger than the sum of its proper divisors (11241504098).

21698716726 is a wasteful number, since it uses less digits than its factorization.

21698716726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130715246.

The product of its digits is 3048192, while the sum is 55.

The spelling of 21698716726 in words is "twenty-one billion, six hundred ninety-eight million, seven hundred sixteen thousand, seven hundred twenty-six".