99932221 has 2 divisors, whose sum is σ = 99932222. Its totient is φ = 99932220.

The previous prime is 99932219. The next prime is 99932257. The reversal of 99932221 is 12223999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99780121 + 152100 = 9989^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 99932221 - 2¹ = 99932219 is a prime.

Together with 99932219, it forms a pair of twin primes.

It is a Chen 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 (99932201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49966110 + 49966111.

It is an arithmetic number, because the mean of its divisors is an integer number (49966111).

Almost surely, 2^99932221 is an apocalyptic number.

It is an amenable number.

99932221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99932221 is an equidigital number, since it uses as much as digits as its factorization.

99932221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 99932221 is about 9996.6104755562. The cubic root of 99932221 is about 464.0539922431.

It can be divided in two parts, 9993 and 2221, that multiplied together give a triangular number (22194453 = T₆₆₆₂).

The spelling of 99932221 in words is "ninety-nine million, nine hundred thirty-two thousand, two hundred twenty-one".