21850727768 has 8 divisors (see below), whose sum is σ = 40970114580. Its totient is φ = 10925363880.

The previous prime is 21850727753. The next prime is 21850727771. The reversal of 21850727768 is 86772705812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365670478 + ... + 1365670493.

Almost surely, 2^21850727768 is an apocalyptic number.

It is an amenable number.

21850727768 is a deficient number, since it is larger than the sum of its proper divisors (19119386812).

21850727768 is a wasteful number, since it uses less digits than its factorization.

21850727768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731340977 (or 2731340973 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 53.

The spelling of 21850727768 in words is "twenty-one billion, eight hundred fifty million, seven hundred twenty-seven thousand, seven hundred sixty-eight".