212120189 has 2 divisors, whose sum is σ = 212120190. Its totient is φ = 212120188.

The previous prime is 212120179. The next prime is 212120201. The reversal of 212120189 is 981021212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106708900 + 105411289 = 10330^2 + 10267^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120189 - 2⁴ = 212120173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212120159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060094 + 106060095.

It is an arithmetic number, because the mean of its divisors is an integer number (106060095).

Almost surely, 2^212120189 is an apocalyptic number.

It is an amenable number.

212120189 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120189 is an equidigital number, since it uses as much as digits as its factorization.

212120189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 212120189 is about 14564.3465009591. The cubic root of 212120189 is about 596.3858560579.

The spelling of 212120189 in words is "two hundred twelve million, one hundred twenty thousand, one hundred eighty-nine".