21563445276268 has 48 divisors (see below), whose sum is σ = 44881174840320. Its totient is φ = 8869374916416.

The previous prime is 21563445276187. The next prime is 21563445276301. The reversal of 21563445276268 is 86267254436512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79373280 + ... + 79644487.

It is an arithmetic number, because the mean of its divisors is an integer number (935024475840).

Almost surely, 2^{21563445276268} is an apocalyptic number.

21563445276268 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21563445276268 is an abundant number, since it is smaller than the sum of its proper divisors (23317729564052).

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

21563445276268 is a wasteful number, since it uses less digits than its factorization.

21563445276268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159017974 (or 159017972 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 61.

The spelling of 21563445276268 in words is "twenty-one trillion, five hundred sixty-three billion, four hundred forty-five million, two hundred seventy-six thousand, two hundred sixty-eight".