99533221 has 2 divisors, whose sum is σ = 99533222. Its totient is φ = 99533220.

The previous prime is 99533209. The next prime is 99533227. The reversal of 99533221 is 12233599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58752225 + 40780996 = 7665^2 + 6386^2 .

It is a cyclic number.

It is not a de Polignac number, because 99533221 - 2¹⁹ = 99008933 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99533227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49766610 + 49766611.

It is an arithmetic number, because the mean of its divisors is an integer number (49766611).

Almost surely, 2^99533221 is an apocalyptic number.

It is an amenable number.

99533221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99533221 is an equidigital number, since it uses as much as digits as its factorization.

99533221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 34.

The square root of 99533221 is about 9976.6337509202. The cubic root of 99533221 is about 463.4355580161.

The spelling of 99533221 in words is "ninety-nine million, five hundred thirty-three thousand, two hundred twenty-one".