1212421210009 has 2 divisors, whose sum is σ = 1212421210010. Its totient is φ = 1212421210008.

The previous prime is 1212421209997. The next prime is 1212421210061. The reversal of 1212421210009 is 9000121242121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1212421210000 + 9 = 1101100^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212421210009 - 2⁹ = 1212421209497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212421210309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606210605004 + 606210605005.

It is an arithmetic number, because the mean of its divisors is an integer number (606210605005).

Almost surely, 2^{1212421210009} is an apocalyptic number.

It is an amenable number.

1212421210009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212421210009 is an equidigital number, since it uses as much as digits as its factorization.

1212421210009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 1212421210009 in words is "one trillion, two hundred twelve billion, four hundred twenty-one million, two hundred ten thousand, nine".