9945221 has 16 divisors (see below), whose sum is σ = 12374208. Its totient is φ = 7852800.

The previous prime is 9945211. The next prime is 9945233. The reversal of 9945221 is 1225499.

9945221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9945221 - 2⁶ = 9945157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386 + ... + 4476.

It is an arithmetic number, because the mean of its divisors is an integer number (773388).

Almost surely, 2^9945221 is an apocalyptic number.

It is an amenable number.

9945221 is a deficient number, since it is larger than the sum of its proper divisors (2428987).

9945221 is a wasteful number, since it uses less digits than its factorization.

9945221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4132.

The product of its digits is 6480, while the sum is 32.

The square root of 9945221 is about 3153.6044457097. The cubic root of 9945221 is about 215.0493558944.

The spelling of 9945221 in words is "nine million, nine hundred forty-five thousand, two hundred twenty-one".