21359309508 has 36 divisors (see below), whose sum is σ = 54098972928. Its totient is φ = 7105609200.

The previous prime is 21359309501. The next prime is 21359309533. The reversal of 21359309508 is 80590395312.

21359309508 is a `hidden beast` number, since 2 + 1 + 3 + 593 + 0 + 9 + 50 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21359309501) 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 11 ways as a sum of consecutive naturals, for example, 571668 + ... + 607883.

It is an arithmetic number, because the mean of its divisors is an integer number (1502749248).

Almost surely, 2^21359309508 is an apocalyptic number.

It is an amenable number.

21359309508 is an abundant number, since it is smaller than the sum of its proper divisors (32739663420).

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

21359309508 is a wasteful number, since it uses less digits than its factorization.

21359309508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180064 (or 1180059 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 21359309508 in words is "twenty-one billion, three hundred fifty-nine million, three hundred nine thousand, five hundred eight".