99630221 has 2 divisors, whose sum is σ = 99630222. Its totient is φ = 99630220.

The previous prime is 99630197. The next prime is 99630241. The reversal of 99630221 is 12203699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63027721 + 36602500 = 7939^2 + 6050^2 .

It is an emirp because it is prime and its reverse (12203699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99630221 - 2¹⁴ = 99613837 is a prime.

It is equal to p_5741429 and since 99630221 and 5741429 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99630241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49815110 + 49815111.

It is an arithmetic number, because the mean of its divisors is an integer number (49815111).

Almost surely, 2^99630221 is an apocalyptic number.

It is an amenable number.

99630221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99630221 is an equidigital number, since it uses as much as digits as its factorization.

99630221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 99630221 is about 9981.4939262617. The cubic root of 99630221 is about 463.5860560225.

The spelling of 99630221 in words is "ninety-nine million, six hundred thirty thousand, two hundred twenty-one".