10121221211209 has 2 divisors, whose sum is σ = 10121221211210. Its totient is φ = 10121221211208.

The previous prime is 10121221211201. The next prime is 10121221211219. The reversal of 10121221211209 is 90211212212101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5343827435584 + 4777393775625 = 2311672^2 + 2185725^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121221211209 - 2³ = 10121221211201 is a prime.

It is not a weakly prime, because it can be changed into another prime (10121221211201) 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, 5060610605604 + 5060610605605.

It is an arithmetic number, because the mean of its divisors is an integer number (5060610605605).

Almost surely, 2^{10121221211209} is an apocalyptic number.

It is an amenable number.

10121221211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

10121221211209 is an equidigital number, since it uses as much as digits as its factorization.

10121221211209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 10121221211209 in words is "ten trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred nine".