21849620768 has 24 divisors (see below), whose sum is σ = 43031782332. Its totient is φ = 10920914176.

The previous prime is 21849620761. The next prime is 21849620777. The reversal of 21849620768 is 86702694812.

It can be written as a sum of positive squares in 2 ways, for example, as 21511502224 + 338118544 = 146668^2 + 18388^2 .

It is not an unprimeable number, because it can be changed into a prime (21849620761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29555 + ... + 211122.

Almost surely, 2^21849620768 is an apocalyptic number.

It is an amenable number.

21849620768 is a deficient number, since it is larger than the sum of its proper divisors (21182161564).

21849620768 is a wasteful number, since it uses less digits than its factorization.

21849620768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243524 (or 243516 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 21849620768 in words is "twenty-one billion, eight hundred forty-nine million, six hundred twenty thousand, seven hundred sixty-eight".