9907221 has 16 divisors (see below), whose sum is σ = 13547520. Its totient is φ = 6438000.

The previous prime is 9907211. The next prime is 9907229. The reversal of 9907221 is 1227099.

It is not a de Polignac number, because 9907221 - 2¹¹ = 9905173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9907229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39346 + ... + 39596.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^9907221 is an apocalyptic number.

It is an amenable number.

9907221 is a deficient number, since it is larger than the sum of its proper divisors (3640299).

9907221 is a wasteful number, since it uses less digits than its factorization.

9907221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 9907221 is about 3147.5738275694. The cubic root of 9907221 is about 214.7751100789.

The spelling of 9907221 in words is "nine million, nine hundred seven thousand, two hundred twenty-one".