11212129909 has 2 divisors, whose sum is σ = 11212129910. Its totient is φ = 11212129908.

The previous prime is 11212129897. The next prime is 11212129931. The reversal of 11212129909 is 90992121211.

11212129909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11179890225 + 32239684 = 105735^2 + 5678^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212129909 - 2¹³ = 11212121717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212129939) 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, 5606064954 + 5606064955.

It is an arithmetic number, because the mean of its divisors is an integer number (5606064955).

Almost surely, 2^11212129909 is an apocalyptic number.

It is an amenable number.

11212129909 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212129909 is an equidigital number, since it uses as much as digits as its factorization.

11212129909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 11212129909 in words is "eleven billion, two hundred twelve million, one hundred twenty-nine thousand, nine hundred nine".