21532000205 has 4 divisors (see below), whose sum is σ = 25838400252. Its totient is φ = 17225600160.

The previous prime is 21532000201. The next prime is 21532000207. The reversal of 21532000205 is 50200023512.

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 14337907081 + 7194093124 = 119741^2 + 84818^2 .

It is not a de Polignac number, because 21532000205 - 2² = 21532000201 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 (21532000201) 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, 2153200016 + ... + 2153200025.

It is an arithmetic number, because the mean of its divisors is an integer number (6459600063).

Almost surely, 2^21532000205 is an apocalyptic number.

It is an amenable number.

21532000205 is a deficient number, since it is larger than the sum of its proper divisors (4306400047).

21532000205 is an equidigital number, since it uses as much as digits as its factorization.

21532000205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306400046.

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 21532000205 its reverse (50200023512), we get a palindrome (71732023717).

The spelling of 21532000205 in words is "twenty-one billion, five hundred thirty-two million, two hundred five", and thus it is an aban number.