21796563573 has 12 divisors (see below), whose sum is σ = 31487418508. Its totient is φ = 14529430080.

The previous prime is 21796563527. The next prime is 21796563611. The reversal of 21796563573 is 37536569712.

21796563573 is a `hidden beast` number, since 2 + 1 + 7 + 9 + 6 + 5 + 63 + 573 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20524000644 + 1272562929 = 143262^2 + 35673^2 .

It is not a de Polignac number, because 21796563573 - 2¹⁶ = 21796498037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796563673) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 45658 + ... + 213723.

Almost surely, 2^21796563573 is an apocalyptic number.

It is an amenable number.

21796563573 is a deficient number, since it is larger than the sum of its proper divisors (9690854935).

21796563573 is a wasteful number, since it uses less digits than its factorization.

21796563573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268724 (or 268721 counting only the distinct ones).

The product of its digits is 7144200, while the sum is 54.

The spelling of 21796563573 in words is "twenty-one billion, seven hundred ninety-six million, five hundred sixty-three thousand, five hundred seventy-three".