8220885521 has 4 divisors (see below), whose sum is σ = 8227664052. Its totient is φ = 8214106992.

The previous prime is 8220885473. The next prime is 8220885539. The reversal of 8220885521 is 1255880228.

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 796650625 + 7424234896 = 28225^2 + 86164^2 .

It is a cyclic number.

It is not a de Polignac number, because 8220885521 - 2³⁰ = 7147143697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8220885821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3387446 + ... + 3389871.

It is an arithmetic number, because the mean of its divisors is an integer number (2056916013).

Almost surely, 2^8220885521 is an apocalyptic number.

It is an amenable number.

8220885521 is a deficient number, since it is larger than the sum of its proper divisors (6778531).

8220885521 is a wasteful number, since it uses less digits than its factorization.

8220885521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6778530.

The product of its (nonzero) digits is 102400, while the sum is 41.

The square root of 8220885521 is about 90669.0990415147. The cubic root of 8220885521 is about 2018.2402673509.

The spelling of 8220885521 in words is "eight billion, two hundred twenty million, eight hundred eighty-five thousand, five hundred twenty-one".