21765856712 has 32 divisors (see below), whose sum is σ = 41082121080. Its totient is φ = 10810759680.

The previous prime is 21765856699. The next prime is 21765856747.

21765856712 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 12052965796 + 9712890916 = 109786^2 + 98554^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1372058 + ... + 1387830.

Almost surely, 2^21765856712 is an apocalyptic number.

It is an amenable number.

21765856712 is a deficient number, since it is larger than the sum of its proper divisors (19316264368).

21765856712 is a wasteful number, since it uses less digits than its factorization.

21765856712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16913 (or 16909 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 50.

The spelling of 21765856712 in words is "twenty-one billion, seven hundred sixty-five million, eight hundred fifty-six thousand, seven hundred twelve".