211323109 has 2 divisors, whose sum is σ = 211323110. Its totient is φ = 211323108.

The previous prime is 211323089. The next prime is 211323121. The reversal of 211323109 is 901323112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173844225 + 37478884 = 13185^2 + 6122^2 .

It is a cyclic number.

It is not a de Polignac number, because 211323109 - 2⁷ = 211322981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211323109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211326109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105661554 + 105661555.

It is an arithmetic number, because the mean of its divisors is an integer number (105661555).

Almost surely, 2^211323109 is an apocalyptic number.

It is an amenable number.

211323109 is a deficient number, since it is larger than the sum of its proper divisors (1).

211323109 is an equidigital number, since it uses as much as digits as its factorization.

211323109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 211323109 is about 14536.9566622454. The cubic root of 211323109 is about 595.6379091625.

The spelling of 211323109 in words is "two hundred eleven million, three hundred twenty-three thousand, one hundred nine".