10428721505 has 4 divisors (see below), whose sum is σ = 12514465812. Its totient is φ = 8342977200.

The previous prime is 10428721489. The next prime is 10428721517. The reversal of 10428721505 is 50512782401.

10428721505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50512782401 = 271 ⋅186394031.

It can be written as a sum of positive squares in 2 ways, for example, as 6575912464 + 3852809041 = 81092^2 + 62071^2 .

It is not a de Polignac number, because 10428721505 - 2⁴ = 10428721489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1042872146 + ... + 1042872155.

It is an arithmetic number, because the mean of its divisors is an integer number (3128616453).

Almost surely, 2^10428721505 is an apocalyptic number.

It is an amenable number.

10428721505 is a deficient number, since it is larger than the sum of its proper divisors (2085744307).

10428721505 is an equidigital number, since it uses as much as digits as its factorization.

10428721505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085744306.

The product of its (nonzero) digits is 22400, while the sum is 35.

The spelling of 10428721505 in words is "ten billion, four hundred twenty-eight million, seven hundred twenty-one thousand, five hundred five".