21200529609 has 24 divisors (see below), whose sum is σ = 37056389760. Its totient is φ = 11401964928.

The previous prime is 21200529607. The next prime is 21200529689. The reversal of 21200529609 is 90692500212.

It is a happy number.

21200529609 is a `hidden beast` number, since 2 + 1 + 20 + 0 + 5 + 29 + 609 = 666.

It is not a de Polignac number, because 21200529609 - 2¹ = 21200529607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21200529607) 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 23 ways as a sum of consecutive naturals, for example, 9896469 + ... + 9898610.

It is an arithmetic number, because the mean of its divisors is an integer number (1544016240).

Almost surely, 2^21200529609 is an apocalyptic number.

It is an amenable number.

21200529609 is a deficient number, since it is larger than the sum of its proper divisors (15855860151).

21200529609 is a wasteful number, since it uses less digits than its factorization.

21200529609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19795109 (or 19795106 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 21200529609 in words is "twenty-one billion, two hundred million, five hundred twenty-nine thousand, six hundred nine".