211217863 has 2 divisors, whose sum is σ = 211217864. Its totient is φ = 211217862.

The previous prime is 211217821. The next prime is 211217869. The reversal of 211217863 is 368712112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211217863 - 2¹³ = 211209671 is a prime.

It is a super-2 number, since 2×211217863² = 89225971300573538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211217869) 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, 105608931 + 105608932.

It is an arithmetic number, because the mean of its divisors is an integer number (105608932).

Almost surely, 2^211217863 is an apocalyptic number.

211217863 is a deficient number, since it is larger than the sum of its proper divisors (1).

211217863 is an equidigital number, since it uses as much as digits as its factorization.

211217863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 211217863 is about 14533.3362652902. The cubic root of 211217863 is about 595.5390101865.

Adding to 211217863 its reverse (368712112), we get a palindrome (579929975).

The spelling of 211217863 in words is "two hundred eleven million, two hundred seventeen thousand, eight hundred sixty-three".