211340257 has 2 divisors, whose sum is σ = 211340258. Its totient is φ = 211340256.

The previous prime is 211340167. The next prime is 211340267. The reversal of 211340257 is 752043112.

It is a happy number.

211340257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193098816 + 18241441 = 13896^2 + 4271^2 .

It is a cyclic number.

It is not a de Polignac number, because 211340257 - 2²³ = 202951649 is a prime.

It is not a weakly prime, because it can be changed into another prime (211340267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105670128 + 105670129.

It is an arithmetic number, because the mean of its divisors is an integer number (105670129).

Almost surely, 2^211340257 is an apocalyptic number.

It is an amenable number.

211340257 is a deficient number, since it is larger than the sum of its proper divisors (1).

211340257 is an equidigital number, since it uses as much as digits as its factorization.

211340257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 211340257 is about 14537.5464573634. The cubic root of 211340257 is about 595.6540199145.

Adding to 211340257 its reverse (752043112), we get a palindrome (963383369).

The spelling of 211340257 in words is "two hundred eleven million, three hundred forty thousand, two hundred fifty-seven".