21776861696 has 40 divisors (see below), whose sum is σ = 43548189300. Its totient is φ = 10879172608.

The previous prime is 21776861681. The next prime is 21776861707. The reversal of 21776861696 is 69616867712.

It can be written as a sum of positive squares in 2 ways, for example, as 18867769600 + 2909092096 = 137360^2 + 53936^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605630 + ... + 640578.

Almost surely, 2^21776861696 is an apocalyptic number.

It is an amenable number.

21776861696 is a deficient number, since it is larger than the sum of its proper divisors (21771327604).

21776861696 is an equidigital number, since it uses as much as digits as its factorization.

21776861696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36184 (or 36168 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 59.

The spelling of 21776861696 in words is "twenty-one billion, seven hundred seventy-six million, eight hundred sixty-one thousand, six hundred ninety-six".