212303209 has 2 divisors, whose sum is σ = 212303210. Its totient is φ = 212303208.

The previous prime is 212303197. The next prime is 212303219. The reversal of 212303209 is 902303212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210685225 + 1617984 = 14515^2 + 1272^2 .

It is a cyclic number.

It is not a de Polignac number, because 212303209 - 2⁵ = 212303177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212303209.

It is not a weakly prime, because it can be changed into another prime (212303219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106151604 + 106151605.

It is an arithmetic number, because the mean of its divisors is an integer number (106151605).

Almost surely, 2^212303209 is an apocalyptic number.

It is an amenable number.

212303209 is a deficient number, since it is larger than the sum of its proper divisors (1).

212303209 is an equidigital number, since it uses as much as digits as its factorization.

212303209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 212303209 is about 14570.6282980522. The cubic root of 212303209 is about 596.5573298542.

The spelling of 212303209 in words is "two hundred twelve million, three hundred three thousand, two hundred nine".