1212210212189 has 2 divisors, whose sum is σ = 1212210212190. Its totient is φ = 1212210212188.

The previous prime is 1212210212149. The next prime is 1212210212231. The reversal of 1212210212189 is 9812120122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611941659289 + 600268552900 = 782267^2 + 774770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212210212189 - 2⁴⁰ = 112698584413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212210212149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105106094 + 606105106095.

It is an arithmetic number, because the mean of its divisors is an integer number (606105106095).

Almost surely, 2^{1212210212189} is an apocalyptic number.

It is an amenable number.

1212210212189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212210212189 is an equidigital number, since it uses as much as digits as its factorization.

1212210212189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 1212210212189 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twelve thousand, one hundred eighty-nine".