212111210122109 has 2 divisors, whose sum is σ = 212111210122110. Its totient is φ = 212111210122108.

The previous prime is 212111210122067. The next prime is 212111210122129. The reversal of 212111210122109 is 901221012111212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151137444677209 + 60973765444900 = 12293797^2 + 7808570^2 .

It is a cyclic number.

It is not a de Polignac number, because 212111210122109 - 2¹⁶ = 212111210056573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212111210122129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106055605061054 + 106055605061055.

It is an arithmetic number, because the mean of its divisors is an integer number (106055605061055).

Almost surely, 2^{212111210122109} is an apocalyptic number.

It is an amenable number.

212111210122109 is a deficient number, since it is larger than the sum of its proper divisors (1).

212111210122109 is an equidigital number, since it uses as much as digits as its factorization.

212111210122109 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 26.

The spelling of 212111210122109 in words is "two hundred twelve trillion, one hundred eleven billion, two hundred ten million, one hundred twenty-two thousand, one hundred nine".