12121230109 has 2 divisors, whose sum is σ = 12121230110. Its totient is φ = 12121230108.

The previous prime is 12121230103. The next prime is 12121230131. The reversal of 12121230109 is 90103212121.

It is an a-pointer prime, because the next prime (12121230131) can be obtained adding 12121230109 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9135154084 + 2986076025 = 95578^2 + 54645^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121230109 - 2²³ = 12112841501 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12121230109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121230103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060615054 + 6060615055.

It is an arithmetic number, because the mean of its divisors is an integer number (6060615055).

Almost surely, 2^12121230109 is an apocalyptic number.

It is an amenable number.

12121230109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121230109 is an equidigital number, since it uses as much as digits as its factorization.

12121230109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

It can be divided in two parts, 121212 and 30109, that added together give a square (151321 = 389²).

The spelling of 12121230109 in words is "twelve billion, one hundred twenty-one million, two hundred thirty thousand, one hundred nine".