212228389 has 2 divisors, whose sum is σ = 212228390. Its totient is φ = 212228388.

The previous prime is 212228339. The next prime is 212228407. The reversal of 212228389 is 983822212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206152164 + 6076225 = 14358^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 212228389 - 2¹⁷ = 212097317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212228339) 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, 106114194 + 106114195.

It is an arithmetic number, because the mean of its divisors is an integer number (106114195).

Almost surely, 2^212228389 is an apocalyptic number.

It is an amenable number.

212228389 is a deficient number, since it is larger than the sum of its proper divisors (1).

212228389 is an equidigital number, since it uses as much as digits as its factorization.

212228389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 212228389 is about 14568.0605778532. The cubic root of 212228389 is about 596.4872419455.

The spelling of 212228389 in words is "two hundred twelve million, two hundred twenty-eight thousand, three hundred eighty-nine".