8921321 has 2 divisors, whose sum is σ = 8921322. Its totient is φ = 8921320.

The previous prime is 8921287. The next prime is 8921333. The reversal of 8921321 is 1231298.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 1413721 = 2740^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 8921321 - 2¹⁴ = 8904937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8921371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4460660 + 4460661.

It is an arithmetic number, because the mean of its divisors is an integer number (4460661).

Almost surely, 2^8921321 is an apocalyptic number.

It is an amenable number.

8921321 is a deficient number, since it is larger than the sum of its proper divisors (1).

8921321 is an equidigital number, since it uses as much as digits as its factorization.

8921321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 8921321 is about 2986.8580481837. The cubic root of 8921321 is about 207.4004632198.

The spelling of 8921321 in words is "eight million, nine hundred twenty-one thousand, three hundred twenty-one".