21652534529 has 4 divisors (see below), whose sum is σ = 21675255876. Its totient is φ = 21629813184.

The previous prime is 21652534471. The next prime is 21652534543. The reversal of 21652534529 is 92543525612.

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 9013603600 + 12638930929 = 94940^2 + 112423^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21652534529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21652534529.

It is not an unprimeable number, because it can be changed into a prime (21652524529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11359244 + ... + 11361149.

It is an arithmetic number, because the mean of its divisors is an integer number (5418813969).

Almost surely, 2^21652534529 is an apocalyptic number.

It is an amenable number.

21652534529 is a deficient number, since it is larger than the sum of its proper divisors (22721347).

21652534529 is an equidigital number, since it uses as much as digits as its factorization.

21652534529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22721346.

The product of its digits is 648000, while the sum is 44.

The spelling of 21652534529 in words is "twenty-one billion, six hundred fifty-two million, five hundred thirty-four thousand, five hundred twenty-nine".