21286932608 has 32 divisors (see below), whose sum is σ = 42422909760. Its totient is φ = 10639614208.

The previous prime is 21286932577. The next prime is 21286932617. The reversal of 21286932608 is 80623968212.

It is a tau number, because it is divible by the number of its divisors (32).

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, 342941 + ... + 400227.

It is an arithmetic number, because the mean of its divisors is an integer number (1325715930).

Almost surely, 2^21286932608 is an apocalyptic number.

It is an amenable number.

21286932608 is a deficient number, since it is larger than the sum of its proper divisors (21135977152).

21286932608 is an equidigital number, since it uses as much as digits as its factorization.

21286932608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60204 (or 60192 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 21286932608 in words is "twenty-one billion, two hundred eighty-six million, nine hundred thirty-two thousand, six hundred eight".