9929221 has 2 divisors, whose sum is σ = 9929222. Its totient is φ = 9929220.

The previous prime is 9929203. The next prime is 9929233. The reversal of 9929221 is 1229299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8328996 + 1600225 = 2886^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 9929221 - 2⁵ = 9929189 is a prime.

9929221 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9929201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4964610 + 4964611.

It is an arithmetic number, because the mean of its divisors is an integer number (4964611).

Almost surely, 2^9929221 is an apocalyptic number.

It is an amenable number.

9929221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9929221 is an equidigital number, since it uses as much as digits as its factorization.

9929221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 9929221 is about 3151.0666448046. The cubic root of 9929221 is about 214.9339692666.

The spelling of 9929221 in words is "nine million, nine hundred twenty-nine thousand, two hundred twenty-one".