123205211 has 2 divisors, whose sum is σ = 123205212. Its totient is φ = 123205210.

The previous prime is 123205133. The next prime is 123205213. The reversal of 123205211 is 112502321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123205211 is a prime.

Together with 123205213, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123205211.

It is not a weakly prime, because it can be changed into another prime (123205213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61602605 + 61602606.

It is an arithmetic number, because the mean of its divisors is an integer number (61602606).

Almost surely, 2^123205211 is an apocalyptic number.

123205211 is a deficient number, since it is larger than the sum of its proper divisors (1).

123205211 is an equidigital number, since it uses as much as digits as its factorization.

123205211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 123205211 is about 11099.7842771830. The cubic root of 123205211 is about 497.5954023585.

Adding to 123205211 its reverse (112502321), we get a palindrome (235707532).

The spelling of 123205211 in words is "one hundred twenty-three million, two hundred five thousand, two hundred eleven".