21928766726 has 4 divisors (see below), whose sum is σ = 32893150092. Its totient is φ = 10964383362.

The previous prime is 21928766711. The next prime is 21928766731. The reversal of 21928766726 is 62766782912.

21928766726 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5482191680 + ... + 5482191683.

It is an arithmetic number, because the mean of its divisors is an integer number (8223287523).

Almost surely, 2^21928766726 is an apocalyptic number.

21928766726 is a deficient number, since it is larger than the sum of its proper divisors (10964383366).

21928766726 is a wasteful number, since it uses less digits than its factorization.

21928766726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10964383365.

The product of its digits is 6096384, while the sum is 56.

The spelling of 21928766726 in words is "twenty-one billion, nine hundred twenty-eight million, seven hundred sixty-six thousand, seven hundred twenty-six".