21728567080 has 64 divisors (see below), whose sum is σ = 53349192000. Its totient is φ = 7899010560.

The previous prime is 21728566987. The next prime is 21728567093. The reversal of 21728567080 is 8076582712.

It is a self number, because there is not a number n which added to its sum of digits gives 21728567080.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2569339 + ... + 2577781.

It is an arithmetic number, because the mean of its divisors is an integer number (833581125).

Almost surely, 2^21728567080 is an apocalyptic number.

21728567080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21728567080 is an abundant number, since it is smaller than the sum of its proper divisors (31620624920).

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

21728567080 is a wasteful number, since it uses less digits than its factorization.

21728567080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14314 (or 14310 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 21728567080 in words is "twenty-one billion, seven hundred twenty-eight million, five hundred sixty-seven thousand, eighty".