9919221 has 16 divisors (see below), whose sum is σ = 14382144. Its totient is φ = 6044544.

The previous prime is 9919201. The next prime is 9919223. The reversal of 9919221 is 1229199.

It is not a de Polignac number, because 9919221 - 2⁹ = 9918709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919223) 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, 2985 + ... + 5361.

It is an arithmetic number, because the mean of its divisors is an integer number (898884).

Almost surely, 2^9919221 is an apocalyptic number.

It is an amenable number.

9919221 is a deficient number, since it is larger than the sum of its proper divisors (4462923).

9919221 is a wasteful number, since it uses less digits than its factorization.

9919221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500.

The product of its digits is 2916, while the sum is 33.

The square root of 9919221 is about 3149.4794808031. The cubic root of 9919221 is about 214.8617896650.

The spelling of 9919221 in words is "nine million, nine hundred nineteen thousand, two hundred twenty-one".