28321044721 has 8 divisors (see below), whose sum is σ = 29978974080. Its totient is φ = 26708538192.

The previous prime is 28321044709. The next prime is 28321044737. The reversal of 28321044721 is 12744012382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28321044721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28321044751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11354425 + ... + 11356918.

It is an arithmetic number, because the mean of its divisors is an integer number (3747371760).

Almost surely, 2^28321044721 is an apocalyptic number.

It is an amenable number.

28321044721 is a deficient number, since it is larger than the sum of its proper divisors (1657929359).

28321044721 is a wasteful number, since it uses less digits than its factorization.

28321044721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22711415.

The product of its (nonzero) digits is 21504, while the sum is 34.

The spelling of 28321044721 in words is "twenty-eight billion, three hundred twenty-one million, forty-four thousand, seven hundred twenty-one".