21767966047828 has 96 divisors (see below), whose sum is σ = 51150031527168. Its totient is φ = 7828191820800.

The previous prime is 21767966047783. The next prime is 21767966047829. The reversal of 21767966047828 is 82874066976712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21767966047829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74396458 + ... + 74688478.

It is an arithmetic number, because the mean of its divisors is an integer number (532812828408).

Almost surely, 2^{21767966047828} is an apocalyptic number.

21767966047828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21767966047828 is an abundant number, since it is smaller than the sum of its proper divisors (29382065479340).

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

21767966047828 is a wasteful number, since it uses less digits than its factorization.

21767966047828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310673 (or 310671 counting only the distinct ones).

The product of its (nonzero) digits is 682795008, while the sum is 73.

The spelling of 21767966047828 in words is "twenty-one trillion, seven hundred sixty-seven billion, nine hundred sixty-six million, forty-seven thousand, eight hundred twenty-eight".