21328529616 has 30 divisors (see below), whose sum is σ = 59690260370. Its totient is φ = 7109509824.

The previous prime is 21328529603. The next prime is 21328529623. The reversal of 21328529616 is 61692582312.

21328529616 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 8 + 5 + 29 + 616 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17291198016 + 4037331600 = 131496^2 + 63540^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 74057251 + ... + 74057538.

Almost surely, 2^21328529616 is an apocalyptic number.

It is an amenable number.

21328529616 is an abundant number, since it is smaller than the sum of its proper divisors (38361730754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21328529616 is a wasteful number, since it uses less digits than its factorization.

21328529616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148114803 (or 148114794 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 21328529616 in words is "twenty-one billion, three hundred twenty-eight million, five hundred twenty-nine thousand, six hundred sixteen".