1212220222189 has 2 divisors, whose sum is σ = 1212220222190. Its totient is φ = 1212220222188.

The previous prime is 1212220222177. The next prime is 1212220222223. The reversal of 1212220222189 is 9812220222121.

It is a happy number.

It is an a-pointer prime, because the next prime (1212220222223) can be obtained adding 1212220222189 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199809148164 + 12411074025 = 1095358^2 + 111405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212220222189 - 2⁹ = 1212220221677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212220222489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110111094 + 606110111095.

It is an arithmetic number, because the mean of its divisors is an integer number (606110111095).

Almost surely, 2^{1212220222189} is an apocalyptic number.

It is an amenable number.

1212220222189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212220222189 is an equidigital number, since it uses as much as digits as its factorization.

1212220222189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 1212220222189 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred twenty-two thousand, one hundred eighty-nine".