121100992009 has 2 divisors, whose sum is σ = 121100992010. Its totient is φ = 121100992008.

The previous prime is 121100991953. The next prime is 121100992057. The reversal of 121100992009 is 900299001121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101910985225 + 19190006784 = 319235^2 + 138528^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100992009 - 2¹⁵ = 121100959241 is a prime.

It is not a weakly prime, because it can be changed into another prime (121100992079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550496004 + 60550496005.

It is an arithmetic number, because the mean of its divisors is an integer number (60550496005).

Almost surely, 2^121100992009 is an apocalyptic number.

It is an amenable number.

121100992009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100992009 is an equidigital number, since it uses as much as digits as its factorization.

121100992009 is an evil number, because the sum of its binary digits is even.

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

The spelling of 121100992009 in words is "one hundred twenty-one billion, one hundred million, nine hundred ninety-two thousand, nine".