99121200109 has 2 divisors, whose sum is σ = 99121200110. Its totient is φ = 99121200108.

The previous prime is 99121200103. The next prime is 99121200137. The reversal of 99121200109 is 90100212199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83638375209 + 15482824900 = 289203^2 + 124430^2 .

It is a cyclic number.

It is not a de Polignac number, because 99121200109 - 2⁷ = 99121199981 is a prime.

It is a super-2 number, since 2×99121200109² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99121200103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49560600054 + 49560600055.

It is an arithmetic number, because the mean of its divisors is an integer number (49560600055).

Almost surely, 2^99121200109 is an apocalyptic number.

It is an amenable number.

99121200109 is a deficient number, since it is larger than the sum of its proper divisors (1).

99121200109 is an equidigital number, since it uses as much as digits as its factorization.

99121200109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 99121200109 in words is "ninety-nine billion, one hundred twenty-one million, two hundred thousand, one hundred nine".