1212210220189 has 2 divisors, whose sum is σ = 1212210220190. Its totient is φ = 1212210220188.

The previous prime is 1212210220187. The next prime is 1212210220223. The reversal of 1212210220189 is 9810220122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 778864496089 + 433345724100 = 882533^2 + 658290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212210220189 - 2¹ = 1212210220187 is a prime.

Together with 1212210220187, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1212210220189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212210220187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105110094 + 606105110095.

It is an arithmetic number, because the mean of its divisors is an integer number (606105110095).

Almost surely, 2^{1212210220189} is an apocalyptic number.

It is an amenable number.

1212210220189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212210220189 is an equidigital number, since it uses as much as digits as its factorization.

1212210220189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 1212210220189 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twenty thousand, one hundred eighty-nine".