99927221 has 2 divisors, whose sum is σ = 99927222. Its totient is φ = 99927220.

The previous prime is 99927199. The next prime is 99927257. The reversal of 99927221 is 12272999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99720196 + 207025 = 9986^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 99927221 - 2¹⁸ = 99665077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99927271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49963610 + 49963611.

It is an arithmetic number, because the mean of its divisors is an integer number (49963611).

Almost surely, 2^99927221 is an apocalyptic number.

It is an amenable number.

99927221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99927221 is an equidigital number, since it uses as much as digits as its factorization.

99927221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 99927221 is about 9996.3603876611. The cubic root of 99927221 is about 464.0462526351.

The spelling of 99927221 in words is "ninety-nine million, nine hundred twenty-seven thousand, two hundred twenty-one".