8821505321 has 2 divisors, whose sum is σ = 8821505322. Its totient is φ = 8821505320.

The previous prime is 8821505267. The next prime is 8821505323. The reversal of 8821505321 is 1235051288.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8721505321 + 100000000 = 93389^2 + 10000^2 .

It is a cyclic number.

It is not a de Polignac number, because 8821505321 - 2¹⁸ = 8821243177 is a prime.

It is a super-2 number, since 2×8821505321² (a number of 21 digits) contains 22 as substring.

Together with 8821505323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8821505323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4410752660 + 4410752661.

It is an arithmetic number, because the mean of its divisors is an integer number (4410752661).

Almost surely, 2^8821505321 is an apocalyptic number.

It is an amenable number.

8821505321 is a deficient number, since it is larger than the sum of its proper divisors (1).

8821505321 is an equidigital number, since it uses as much as digits as its factorization.

8821505321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 8821505321 is about 93922.8689989824. The cubic root of 8821505321 is about 2066.2406442560.

The spelling of 8821505321 in words is "eight billion, eight hundred twenty-one million, five hundred five thousand, three hundred twenty-one".