21563113118643 has 32 divisors (see below), whose sum is σ = 31960318149120. Its totient is φ = 14368675963680.

The previous prime is 21563113118641. The next prime is 21563113118647. The reversal of 21563113118643 is 34681131136512.

21563113118643 is a `hidden beast` number, since 2 + 1 + 5 + 631 + 1 + 3 + 1 + 1 + 8 + 6 + 4 + 3 = 666.

It is not a de Polignac number, because 21563113118643 - 2¹ = 21563113118641 is a prime.

It is a super-2 number, since 2×21563113118643² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21563113118641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 604380321 + ... + 604415997.

It is an arithmetic number, because the mean of its divisors is an integer number (998759942160).

Almost surely, 2^{21563113118643} is an apocalyptic number.

21563113118643 is a deficient number, since it is larger than the sum of its proper divisors (10397205030477).

21563113118643 is a wasteful number, since it uses less digits than its factorization.

21563113118643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45544 (or 45538 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 21563113118643 in words is "twenty-one trillion, five hundred sixty-three billion, one hundred thirteen million, one hundred eighteen thousand, six hundred forty-three".