121011109 has 2 divisors, whose sum is σ = 121011110. Its totient is φ = 121011108.

The previous prime is 121011101. The next prime is 121011181. The reversal of 121011109 is 901110121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110187009 + 10824100 = 10497^2 + 3290^2 .

It is a cyclic number.

It is not a de Polignac number, because 121011109 - 2³ = 121011101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121011092 and 121011101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121011101) 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, 60505554 + 60505555.

It is an arithmetic number, because the mean of its divisors is an integer number (60505555).

Almost surely, 2^121011109 is an apocalyptic number.

It is an amenable number.

121011109 is a deficient number, since it is larger than the sum of its proper divisors (1).

121011109 is an equidigital number, since it uses as much as digits as its factorization.

121011109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 121011109 is about 11000.5049429560. The cubic root of 121011109 is about 494.6238805243.

The spelling of 121011109 in words is "one hundred twenty-one million, eleven thousand, one hundred nine".