211222643 has 2 divisors, whose sum is σ = 211222644. Its totient is φ = 211222642.

The previous prime is 211222553. The next prime is 211222663. The reversal of 211222643 is 346222112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211222643 is a prime.

It is not a weakly prime, because it can be changed into another prime (211222663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611321 + 105611322.

It is an arithmetic number, because the mean of its divisors is an integer number (105611322).

Almost surely, 2^211222643 is an apocalyptic number.

211222643 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222643 is an equidigital number, since it uses as much as digits as its factorization.

211222643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 211222643 is about 14533.5007138679. The cubic root of 211222643 is about 595.5435026332.

Adding to 211222643 its reverse (346222112), we get a palindrome (557444755).

The spelling of 211222643 in words is "two hundred eleven million, two hundred twenty-two thousand, six hundred forty-three".