28423341221 has 24 divisors (see below), whose sum is σ = 31902431904. Its totient is φ = 25112010560.

The previous prime is 28423341173. The next prime is 28423341223. The reversal of 28423341221 is 12214332482.

It is not a de Polignac number, because 28423341221 - 2³⁰ = 27349599397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28423341223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3301895 + ... + 3310491.

It is an arithmetic number, because the mean of its divisors is an integer number (1329267996).

Almost surely, 2^28423341221 is an apocalyptic number.

It is an amenable number.

28423341221 is a deficient number, since it is larger than the sum of its proper divisors (3479090683).

28423341221 is a wasteful number, since it uses less digits than its factorization.

28423341221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821 (or 8768 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

The spelling of 28423341221 in words is "twenty-eight billion, four hundred twenty-three million, three hundred forty-one thousand, two hundred twenty-one".