8573223821 has 2 divisors, whose sum is σ = 8573223822. Its totient is φ = 8573223820.

The previous prime is 8573223751. The next prime is 8573223823. The reversal of 8573223821 is 1283223758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8560875625 + 12348196 = 92525^2 + 3514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8573223821 is a prime.

Together with 8573223823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8573223823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4286611910 + 4286611911.

It is an arithmetic number, because the mean of its divisors is an integer number (4286611911).

Almost surely, 2^8573223821 is an apocalyptic number.

It is an amenable number.

8573223821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8573223821 is an equidigital number, since it uses as much as digits as its factorization.

8573223821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The square root of 8573223821 is about 92591.7049254414. The cubic root of 8573223821 is about 2046.6710851154.

The spelling of 8573223821 in words is "eight billion, five hundred seventy-three million, two hundred twenty-three thousand, eight hundred twenty-one".