211988233 has 2 divisors, whose sum is σ = 211988234. Its totient is φ = 211988232.

The previous prime is 211988221. The next prime is 211988267. The reversal of 211988233 is 332889112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211760704 + 227529 = 14552^2 + 477^2 .

It is a cyclic number.

It is not a de Polignac number, because 211988233 - 2¹⁷ = 211857161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211988192 and 211988201.

It is not a weakly prime, because it can be changed into another prime (211988213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105994116 + 105994117.

It is an arithmetic number, because the mean of its divisors is an integer number (105994117).

Almost surely, 2^211988233 is an apocalyptic number.

It is an amenable number.

211988233 is a deficient number, since it is larger than the sum of its proper divisors (1).

211988233 is an equidigital number, since it uses as much as digits as its factorization.

211988233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 211988233 is about 14559.8156925148. The cubic root of 211988233 is about 596.2621635786.

The spelling of 211988233 in words is "two hundred eleven million, nine hundred eighty-eight thousand, two hundred thirty-three".