211020247 has 2 divisors, whose sum is σ = 211020248. Its totient is φ = 211020246.

The previous prime is 211020241. The next prime is 211020259. The reversal of 211020247 is 742020112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211020247 - 2⁷ = 211020119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211020241) 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, 105510123 + 105510124.

It is an arithmetic number, because the mean of its divisors is an integer number (105510124).

Almost surely, 2^211020247 is an apocalyptic number.

211020247 is a deficient number, since it is larger than the sum of its proper divisors (1).

211020247 is an equidigital number, since it uses as much as digits as its factorization.

211020247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 211020247 is about 14526.5359600973. The cubic root of 211020247 is about 595.3532229342.

Adding to 211020247 its reverse (742020112), we get a palindrome (953040359).

The spelling of 211020247 in words is "two hundred eleven million, twenty thousand, two hundred forty-seven".