28120228421 has 8 divisors (see below), whose sum is σ = 30354670080. Its totient is φ = 25970105392.

The previous prime is 28120228397. The next prime is 28120228459. The reversal of 28120228421 is 12482202182.

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

It is a cyclic number.

It is not a de Polignac number, because 28120228421 - 2¹⁴ = 28120212037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28120218421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21078965 + ... + 21080298.

It is an arithmetic number, because the mean of its divisors is an integer number (3794333760).

Almost surely, 2^28120228421 is an apocalyptic number.

It is an amenable number.

28120228421 is a deficient number, since it is larger than the sum of its proper divisors (2234441659).

28120228421 is a wasteful number, since it uses less digits than its factorization.

28120228421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42159315.

The product of its (nonzero) digits is 8192, while the sum is 32.

The spelling of 28120228421 in words is "twenty-eight billion, one hundred twenty million, two hundred twenty-eight thousand, four hundred twenty-one".