36028215721 has 9 divisors (see below), whose sum is σ = 36586890711. Its totient is φ = 35477953632.

The previous prime is 36028215709. The next prime is 36028215791. The reversal of 36028215721 is 12751282063.

The square root of 36028215721 is 189811.

It is a perfect power (a square), and thus also a powerful number.

36028215721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 14143155625 + 21885060096 = 118925^2 + 147936^2 .

It is not a de Polignac number, because 36028215721 - 2¹¹ = 36028213673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36028215791) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12715921 + ... + 12718753.

It is an arithmetic number, because the mean of its divisors is an integer number (4065210079).

Almost surely, 2^36028215721 is an apocalyptic number.

36028215721 is the 189811-st square number.

36028215721 is the 94906-th centered octagonal number.

It is an amenable number.

36028215721 is a deficient number, since it is larger than the sum of its proper divisors (558674990).

36028215721 is an frugal number, since it uses more digits than its factorization.

36028215721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5800 (or 2900 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

Adding to 36028215721 its reverse (12751282063), we get a palindrome (48779497784).

The spelling of 36028215721 in words is "thirty-six billion, twenty-eight million, two hundred fifteen thousand, seven hundred twenty-one".