1212210221009 has 2 divisors, whose sum is σ = 1212210221010. Its totient is φ = 1212210221008.

The previous prime is 1212210220961. The next prime is 1212210221041. The reversal of 1212210221009 is 9001220122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688729030609 + 523481190400 = 829897^2 + 723520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212210221009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212210241009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105110504 + 606105110505.

It is an arithmetic number, because the mean of its divisors is an integer number (606105110505).

Almost surely, 2^{1212210221009} is an apocalyptic number.

It is an amenable number.

1212210221009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212210221009 is an equidigital number, since it uses as much as digits as its factorization.

1212210221009 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 23.

The spelling of 1212210221009 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twenty-one thousand, nine".