211222663 has 2 divisors, whose sum is σ = 211222664. Its totient is φ = 211222662.

The previous prime is 211222643. The next prime is 211222667. The reversal of 211222663 is 366222112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211222663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611331 + 105611332.

It is an arithmetic number, because the mean of its divisors is an integer number (105611332).

Almost surely, 2^211222663 is an apocalyptic number.

211222663 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222663 is an equidigital number, since it uses as much as digits as its factorization.

211222663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 211222663 is about 14533.5014019334. The cubic root of 211222663 is about 595.5435214299.

Adding to 211222663 its reverse (366222112), we get a palindrome (577444775).

The spelling of 211222663 in words is "two hundred eleven million, two hundred twenty-two thousand, six hundred sixty-three".