21536243533 has 8 divisors (see below), whose sum is σ = 24641376768. Its totient is φ = 18438242064.

The previous prime is 21536243527. The next prime is 21536243537. The reversal of 21536243533 is 33534263512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21536243533 - 2³³ = 12946308941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21536243492 and 21536243501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21536243537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1776466 + ... + 1788547.

It is an arithmetic number, because the mean of its divisors is an integer number (3080172096).

Almost surely, 2^21536243533 is an apocalyptic number.

It is an amenable number.

21536243533 is a deficient number, since it is larger than the sum of its proper divisors (3105133235).

21536243533 is an equidigital number, since it uses as much as digits as its factorization.

21536243533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565883.

The product of its digits is 194400, while the sum is 37.

The spelling of 21536243533 in words is "twenty-one billion, five hundred thirty-six million, two hundred forty-three thousand, five hundred thirty-three".