99998121 has 32 divisors (see below), whose sum is σ = 145152000. Its totient is φ = 61034688.

The previous prime is 99998111. The next prime is 99998147. The reversal of 99998121 is 12189999.

It is not a de Polignac number, because 99998121 - 2⁹ = 99997609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99998111) 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 in 31 ways as a sum of consecutive naturals, for example, 238450 + ... + 238868.

It is an arithmetic number, because the mean of its divisors is an integer number (4536000).

Almost surely, 2^99998121 is an apocalyptic number.

It is an amenable number.

99998121 is a deficient number, since it is larger than the sum of its proper divisors (45153879).

99998121 is a wasteful number, since it uses less digits than its factorization.

99998121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573.

The product of its digits is 104976, while the sum is 48.

The square root of 99998121 is about 9999.9060495587. The cubic root of 99998121 is about 464.1559761613.

The spelling of 99998121 in words is "ninety-nine million, nine hundred ninety-eight thousand, one hundred twenty-one".