211420247 has 2 divisors, whose sum is σ = 211420248. Its totient is φ = 211420246.

The previous prime is 211420229. The next prime is 211420249. The reversal of 211420247 is 742024112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211420247 - 2¹² = 211416151 is a prime.

Together with 211420249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211420249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105710123 + 105710124.

It is an arithmetic number, because the mean of its divisors is an integer number (105710124).

Almost surely, 2^211420247 is an apocalyptic number.

211420247 is a deficient number, since it is larger than the sum of its proper divisors (1).

211420247 is an equidigital number, since it uses as much as digits as its factorization.

211420247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 211420247 is about 14540.2973490916. The cubic root of 211420247 is about 595.7291599687.

Adding to 211420247 its reverse (742024112), we get a palindrome (953444359).

The spelling of 211420247 in words is "two hundred eleven million, four hundred twenty thousand, two hundred forty-seven".