21263928608 has 48 divisors (see below), whose sum is σ = 45096702336. Its totient is φ = 9811272960.

The previous prime is 21263928541. The next prime is 21263928649. The reversal of 21263928608 is 80682936212.

It is a super-2 number, since 2×21263928608² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2259593 + ... + 2268983.

It is an arithmetic number, because the mean of its divisors is an integer number (939514632).

Almost surely, 2^21263928608 is an apocalyptic number.

It is an amenable number.

21263928608 is an abundant number, since it is smaller than the sum of its proper divisors (23832773728).

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

21263928608 is a wasteful number, since it uses less digits than its factorization.

21263928608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14857 (or 14849 counting only the distinct ones).

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

The spelling of 21263928608 in words is "twenty-one billion, two hundred sixty-three million, nine hundred twenty-eight thousand, six hundred eight".