21324014533 has 4 divisors (see below), whose sum is σ = 21325151628. Its totient is φ = 21322877440.

The previous prime is 21324014527. The next prime is 21324014599. The reversal of 21324014533 is 33541042312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7073146404 + 14250868129 = 84102^2 + 119377^2 .

It is a cyclic number.

It is not a de Polignac number, because 21324014533 - 2⁹ = 21324014021 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 (21324014513) 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 3 ways as a sum of consecutive naturals, for example, 539938 + ... + 578083.

It is an arithmetic number, because the mean of its divisors is an integer number (5331287907).

Almost surely, 2^21324014533 is an apocalyptic number.

It is an amenable number.

21324014533 is a deficient number, since it is larger than the sum of its proper divisors (1137095).

21324014533 is a wasteful number, since it uses less digits than its factorization.

21324014533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137094.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21324014533 its reverse (33541042312), we get a palindrome (54865056845).

The spelling of 21324014533 in words is "twenty-one billion, three hundred twenty-four million, fourteen thousand, five hundred thirty-three".