99824221 has 24 divisors (see below), whose sum is σ = 123674040. Its totient is φ = 80059392.

The previous prime is 99824173. The next prime is 99824239. The reversal of 99824221 is 12242899.

It can be written as a sum of positive squares in 4 ways, for example, as 75951225 + 23872996 = 8715^2 + 4886^2 .

It is not a de Polignac number, because 99824221 - 2⁷ = 99824093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99824521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243865 + ... + 244273.

It is an arithmetic number, because the mean of its divisors is an integer number (5153085).

Almost surely, 2^99824221 is an apocalyptic number.

It is an amenable number.

99824221 is a deficient number, since it is larger than the sum of its proper divisors (23849819).

99824221 is a wasteful number, since it uses less digits than its factorization.

99824221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 726 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 99824221 is about 9991.2071843196. The cubic root of 99824221 is about 463.8867592387.

The spelling of 99824221 in words is "ninety-nine million, eight hundred twenty-four thousand, two hundred twenty-one".