21536523063 has 24 divisors (see below), whose sum is σ = 33943029120. Its totient is φ = 13049865360.

The previous prime is 21536523053. The next prime is 21536523089. The reversal of 21536523063 is 36032563512.

21536523063 is a `hidden beast` number, since 2 + 1 + 5 + 365 + 230 + 63 = 666.

It is not a de Polignac number, because 21536523063 - 2⁹ = 21536522551 is a prime.

It is a super-3 number, since 3×21536523063³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21536523013) 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 23 ways as a sum of consecutive naturals, for example, 563520 + ... + 600522.

It is an arithmetic number, because the mean of its divisors is an integer number (1414292880).

Almost surely, 2^21536523063 is an apocalyptic number.

21536523063 is a deficient number, since it is larger than the sum of its proper divisors (12406506057).

21536523063 is a wasteful number, since it uses less digits than its factorization.

21536523063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42899 (or 42896 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The spelling of 21536523063 in words is "twenty-one billion, five hundred thirty-six million, five hundred twenty-three thousand, sixty-three".