122128211 has 2 divisors, whose sum is σ = 122128212. Its totient is φ = 122128210.

The previous prime is 122128177. The next prime is 122128243. The reversal of 122128211 is 112821221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 122128211 - 2⁶ = 122128147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (122128411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61064105 + 61064106.

It is an arithmetic number, because the mean of its divisors is an integer number (61064106).

Almost surely, 2^122128211 is an apocalyptic number.

122128211 is a deficient number, since it is larger than the sum of its proper divisors (1).

122128211 is an equidigital number, since it uses as much as digits as its factorization.

122128211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 20.

The square root of 122128211 is about 11051.1633324279. The cubic root of 122128211 is about 496.1412446230.

Adding to 122128211 its reverse (112821221), we get a palindrome (234949432).

The spelling of 122128211 in words is "one hundred twenty-two million, one hundred twenty-eight thousand, two hundred eleven".