8820721233 has 10 divisors (see below), whose sum is σ = 13176633074. Its totient is φ = 5880480768.

The previous prime is 8820721213. The next prime is 8820721241. The reversal of 8820721233 is 3321270288.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8177946624 + 642774609 = 90432^2 + 25353^2 .

It is not a de Polignac number, because 8820721233 - 2⁸ = 8820720977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8820721213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 54448816 + ... + 54448977.

Almost surely, 2^8820721233 is an apocalyptic number.

It is an amenable number.

8820721233 is a deficient number, since it is larger than the sum of its proper divisors (4355911841).

8820721233 is a wasteful number, since it uses less digits than its factorization.

8820721233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108897805 (or 108897796 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 8820721233 is about 93918.6948003431. The cubic root of 8820721233 is about 2066.1794240735.

The spelling of 8820721233 in words is "eight billion, eight hundred twenty million, seven hundred twenty-one thousand, two hundred thirty-three".