99112020121 has 2 divisors, whose sum is σ = 99112020122. Its totient is φ = 99112020120.

The previous prime is 99112020101. The next prime is 99112020131. The reversal of 99112020121 is 12102021199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71866886400 + 27245133721 = 268080^2 + 165061^2 .

It is an emirp because it is prime and its reverse (12102021199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99112020121 - 2²¹ = 99109922969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99112020121.

It is not a weakly prime, because it can be changed into another prime (99112020101) 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, 49556010060 + 49556010061.

It is an arithmetic number, because the mean of its divisors is an integer number (49556010061).

Almost surely, 2^99112020121 is an apocalyptic number.

It is an amenable number.

99112020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

99112020121 is an equidigital number, since it uses as much as digits as its factorization.

99112020121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 99112020121 in words is "ninety-nine billion, one hundred twelve million, twenty thousand, one hundred twenty-one".