8907221 has 2 divisors, whose sum is σ = 8907222. Its totient is φ = 8907220.

The previous prime is 8907211. The next prime is 8907229. The reversal of 8907221 is 1227098.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7672900 + 1234321 = 2770^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 8907221 - 2¹⁰ = 8906197 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8907229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4453610 + 4453611.

It is an arithmetic number, because the mean of its divisors is an integer number (4453611).

Almost surely, 2^8907221 is an apocalyptic number.

It is an amenable number.

8907221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8907221 is an equidigital number, since it uses as much as digits as its factorization.

8907221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 8907221 is about 2984.4967750024. The cubic root of 8907221 is about 207.2911412740.

The spelling of 8907221 in words is "eight million, nine hundred seven thousand, two hundred twenty-one".