28016514121 has 4 divisors (see below), whose sum is σ = 28016878032. Its totient is φ = 28016150212.

The previous prime is 28016514091. The next prime is 28016514157. The reversal of 28016514121 is 12141561082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28016514121 - 2¹⁷ = 28016383049 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28016517121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16051 + ... + 237256.

It is an arithmetic number, because the mean of its divisors is an integer number (7004219508).

Almost surely, 2^28016514121 is an apocalyptic number.

It is an amenable number.

28016514121 is a deficient number, since it is larger than the sum of its proper divisors (363911).

28016514121 is a wasteful number, since it uses less digits than its factorization.

28016514121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363910.

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 28016514121 in words is "twenty-eight billion, sixteen million, five hundred fourteen thousand, one hundred twenty-one".