212124109 has 2 divisors, whose sum is σ = 212124110. Its totient is φ = 212124108.

The previous prime is 212124053. The next prime is 212124127. The reversal of 212124109 is 901421212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137992009 + 74132100 = 11747^2 + 8610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212124109 is a prime.

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 212124109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212124149) 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, 106062054 + 106062055.

It is an arithmetic number, because the mean of its divisors is an integer number (106062055).

Almost surely, 2^212124109 is an apocalyptic number.

It is an amenable number.

212124109 is a deficient number, since it is larger than the sum of its proper divisors (1).

212124109 is an equidigital number, since it uses as much as digits as its factorization.

212124109 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 22.

The square root of 212124109 is about 14564.4810755481. The cubic root of 212124109 is about 596.3895297898.

The spelling of 212124109 in words is "two hundred twelve million, one hundred twenty-four thousand, one hundred nine".