99308021 has 2 divisors, whose sum is σ = 99308022. Its totient is φ = 99308020.

The previous prime is 99307993. The next prime is 99308029. The reversal of 99308021 is 12080399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97732996 + 1575025 = 9886^2 + 1255^2 .

It is an emirp because it is prime and its reverse (12080399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99308021 - 2²⁶ = 32199157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99308029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49654010 + 49654011.

It is an arithmetic number, because the mean of its divisors is an integer number (49654011).

Almost surely, 2^99308021 is an apocalyptic number.

It is an amenable number.

99308021 is a deficient number, since it is larger than the sum of its proper divisors (1).

99308021 is an equidigital number, since it uses as much as digits as its factorization.

99308021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 99308021 is about 9965.3409876431. The cubic root of 99308021 is about 463.0857769851.

The spelling of 99308021 in words is "ninety-nine million, three hundred eight thousand, twenty-one".