1212021120109 has 2 divisors, whose sum is σ = 1212021120110. Its totient is φ = 1212021120108.

The previous prime is 1212021120103. The next prime is 1212021120133. The reversal of 1212021120109 is 9010211202121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188993968100 + 23027152009 = 1090410^2 + 151747^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212021120109 - 2⁹ = 1212021119597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212021120109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212021120103) 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, 606010560054 + 606010560055.

It is an arithmetic number, because the mean of its divisors is an integer number (606010560055).

Almost surely, 2^{1212021120109} is an apocalyptic number.

It is an amenable number.

1212021120109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212021120109 is an equidigital number, since it uses as much as digits as its factorization.

1212021120109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1212021120109 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred twenty thousand, one hundred nine".