212122102109 has 2 divisors, whose sum is σ = 212122102110. Its totient is φ = 212122102108.

The previous prime is 212122102103. The next prime is 212122102117. The reversal of 212122102109 is 901201221212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191638195225 + 20483906884 = 437765^2 + 143122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212122102109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212122102103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106061051054 + 106061051055.

It is an arithmetic number, because the mean of its divisors is an integer number (106061051055).

Almost surely, 2^212122102109 is an apocalyptic number.

It is an amenable number.

212122102109 is a deficient number, since it is larger than the sum of its proper divisors (1).

212122102109 is an equidigital number, since it uses as much as digits as its factorization.

212122102109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 212122102109 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred two thousand, one hundred nine".