21010556608 has 28 divisors (see below), whose sum is σ = 43130510640. Its totient is φ = 10143026432.

The previous prime is 21010556551. The next prime is 21010556617. The reversal of 21010556608 is 80665501012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5658316 + ... + 5662027.

It is an arithmetic number, because the mean of its divisors is an integer number (1540375380).

Almost surely, 2^21010556608 is an apocalyptic number.

It is an amenable number.

21010556608 is an abundant number, since it is smaller than the sum of its proper divisors (22119954032).

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

21010556608 is a wasteful number, since it uses less digits than its factorization.

21010556608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11320384 (or 11320374 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 21010556608 in words is "twenty-one billion, ten million, five hundred fifty-six thousand, six hundred eight".