99121988993 has 2 divisors, whose sum is σ = 99121988994. Its totient is φ = 99121988992.

The previous prime is 99121988981. The next prime is 99121989007. The reversal of 99121988993 is 39988912199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84350746624 + 14771242369 = 290432^2 + 121537^2 .

It is a cyclic number.

It is not a de Polignac number, because 99121988993 - 2¹⁰ = 99121987969 is a prime.

It is not a weakly prime, because it can be changed into another prime (99121988093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49560994496 + 49560994497.

It is an arithmetic number, because the mean of its divisors is an integer number (49560994497).

Almost surely, 2^99121988993 is an apocalyptic number.

It is an amenable number.

99121988993 is a deficient number, since it is larger than the sum of its proper divisors (1).

99121988993 is an equidigital number, since it uses as much as digits as its factorization.

99121988993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22674816, while the sum is 68.

The spelling of 99121988993 in words is "ninety-nine billion, one hundred twenty-one million, nine hundred eighty-eight thousand, nine hundred ninety-three".