212222189 has 2 divisors, whose sum is σ = 212222190. Its totient is φ = 212222188.

The previous prime is 212222183. The next prime is 212222291. The reversal of 212222189 is 981222212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209757289 + 2464900 = 14483^2 + 1570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212222189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212222183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106111094 + 106111095.

It is an arithmetic number, because the mean of its divisors is an integer number (106111095).

Almost surely, 2^212222189 is an apocalyptic number.

It is an amenable number.

212222189 is a deficient number, since it is larger than the sum of its proper divisors (1).

212222189 is an equidigital number, since it uses as much as digits as its factorization.

212222189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 212222189 is about 14567.8477820164. The cubic root of 212222189 is about 596.4814333338.

The spelling of 212222189 in words is "two hundred twelve million, two hundred twenty-two thousand, one hundred eighty-nine".