12121201109 has 2 divisors, whose sum is σ = 12121201110. Its totient is φ = 12121201108.

The previous prime is 12121201087. The next prime is 12121201129. The reversal of 12121201109 is 90110212121.

It is an a-pointer prime, because the next prime (12121201129) can be obtained adding 12121201109 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9159447025 + 2961754084 = 95705^2 + 54422^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121201109 - 2⁸ = 12121200853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121201129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060600554 + 6060600555.

It is an arithmetic number, because the mean of its divisors is an integer number (6060600555).

Almost surely, 2^12121201109 is an apocalyptic number.

It is an amenable number.

12121201109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121201109 is an equidigital number, since it uses as much as digits as its factorization.

12121201109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 12121201109 in words is "twelve billion, one hundred twenty-one million, two hundred one thousand, one hundred nine".