21067567268 has 24 divisors (see below), whose sum is σ = 40238849280. Its totient is φ = 9571655520.

The previous prime is 21067567253. The next prime is 21067567303. The reversal of 21067567268 is 86276576012.

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 7 ways as a sum of consecutive naturals, for example, 17423 + ... + 206006.

It is an arithmetic number, because the mean of its divisors is an integer number (1676618720).

Almost surely, 2^21067567268 is an apocalyptic number.

It is an amenable number.

21067567268 is a deficient number, since it is larger than the sum of its proper divisors (19171282012).

21067567268 is a wasteful number, since it uses less digits than its factorization.

21067567268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225587 (or 225585 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 21067567268 in words is "twenty-one billion, sixty-seven million, five hundred sixty-seven thousand, two hundred sixty-eight".