8008820221 has 4 divisors (see below), whose sum is σ = 8010114652. Its totient is φ = 8007525792.

The previous prime is 8008820167. The next prime is 8008820233. The reversal of 8008820221 is 1220288008.

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 2460656025 + 5548164196 = 49605^2 + 74486^2 .

It is a cyclic number.

It is not a de Polignac number, because 8008820221 - 2¹³ = 8008812029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8008820251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637890 + ... + 650323.

It is an arithmetic number, because the mean of its divisors is an integer number (2002528663).

Almost surely, 2^8008820221 is an apocalyptic number.

It is an amenable number.

8008820221 is a deficient number, since it is larger than the sum of its proper divisors (1294431).

8008820221 is a wasteful number, since it uses less digits than its factorization.

8008820221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294430.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 8008820221 is about 89492.0120513557. The cubic root of 8008820221 is about 2000.7347484560.

The spelling of 8008820221 in words is "eight billion, eight million, eight hundred twenty thousand, two hundred twenty-one".