1210211021209 has 2 divisors, whose sum is σ = 1210211021210. Its totient is φ = 1210211021208.

The previous prime is 1210211021177. The next prime is 1210211021219. The reversal of 1210211021209 is 9021201120121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 934454755584 + 275756265625 = 966672^2 + 525125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210211021209 - 2⁵ = 1210211021177 is a prime.

It is a super-2 number, since 2×1210211021209² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1210211021209.

It is not a weakly prime, because it can be changed into another prime (1210211021219) 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, 605105510604 + 605105510605.

It is an arithmetic number, because the mean of its divisors is an integer number (605105510605).

Almost surely, 2^{1210211021209} is an apocalyptic number.

It is an amenable number.

1210211021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210211021209 is an equidigital number, since it uses as much as digits as its factorization.

1210211021209 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 1210211021209 in words is "one trillion, two hundred ten billion, two hundred eleven million, twenty-one thousand, two hundred nine".