211303340309 has 2 divisors, whose sum is σ = 211303340310. Its totient is φ = 211303340308.

The previous prime is 211303340279. The next prime is 211303340327. The reversal of 211303340309 is 903043303112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169617951409 + 41685388900 = 411847^2 + 204170^2 .

It is a cyclic number.

It is not a de Polignac number, because 211303340309 - 2¹² = 211303336213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211303340329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105651670154 + 105651670155.

It is an arithmetic number, because the mean of its divisors is an integer number (105651670155).

Almost surely, 2^211303340309 is an apocalyptic number.

It is an amenable number.

211303340309 is a deficient number, since it is larger than the sum of its proper divisors (1).

211303340309 is an equidigital number, since it uses as much as digits as its factorization.

211303340309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 29.

The spelling of 211303340309 in words is "two hundred eleven billion, three hundred three million, three hundred forty thousand, three hundred nine".