28042221105 has 24 divisors (see below), whose sum is σ = 48619529088. Its totient is φ = 14951847456.

The previous prime is 28042220971. The next prime is 28042221107. The reversal of 28042221105 is 50112224082.

28042221105 is a `hidden beast` number, since 28 + 0 + 422 + 211 + 0 + 5 = 666.

It is not a de Polignac number, because 28042221105 - 2¹⁰ = 28042220081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28042221107) 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, 90534 + ... + 253536.

It is an arithmetic number, because the mean of its divisors is an integer number (2025813712).

Almost surely, 2^28042221105 is an apocalyptic number.

It is an amenable number.

28042221105 is a deficient number, since it is larger than the sum of its proper divisors (20577307983).

28042221105 is a wasteful number, since it uses less digits than its factorization.

28042221105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166837 (or 166834 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

Adding to 28042221105 its reverse (50112224082), we get a palindrome (78154445187).

The spelling of 28042221105 in words is "twenty-eight billion, forty-two million, two hundred twenty-one thousand, one hundred five".