28212442121617 has 4 divisors (see below), whose sum is σ = 30382629977140. Its totient is φ = 26042254266096.

The previous prime is 28212442121569. The next prime is 28212442121621. The reversal of 28212442121617 is 71612124421282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1694381235856 + 26518060885761 = 1301684^2 + 5149569^2 .

It is a cyclic number.

It is not a de Polignac number, because 28212442121617 - 2¹¹ = 28212442119569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28212442121687) 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, 1085093927742 + ... + 1085093927767.

It is an arithmetic number, because the mean of its divisors is an integer number (7595657494285).

Almost surely, 2^{28212442121617} is an apocalyptic number.

It is an amenable number.

28212442121617 is a deficient number, since it is larger than the sum of its proper divisors (2170187855523).

28212442121617 is a wasteful number, since it uses less digits than its factorization.

28212442121617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170187855522.

The product of its digits is 172032, while the sum is 43.

Adding to 28212442121617 its reverse (71612124421282), we get a palindrome (99824566542899).

The spelling of 28212442121617 in words is "twenty-eight trillion, two hundred twelve billion, four hundred forty-two million, one hundred twenty-one thousand, six hundred seventeen".