211938211 has 2 divisors, whose sum is σ = 211938212. Its totient is φ = 211938210.

The previous prime is 211938203. The next prime is 211938229. The reversal of 211938211 is 112839112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211938211 - 2³ = 211938203 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211938211.

It is not a weakly prime, because it can be changed into another prime (211938611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105969105 + 105969106.

It is an arithmetic number, because the mean of its divisors is an integer number (105969106).

Almost surely, 2^211938211 is an apocalyptic number.

211938211 is a deficient number, since it is larger than the sum of its proper divisors (1).

211938211 is an equidigital number, since it uses as much as digits as its factorization.

211938211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 211938211 is about 14558.0977809603. The cubic root of 211938211 is about 596.2152607044.

Subtracting from 211938211 its reverse (112839112), we obtain a palindrome (99099099).

The spelling of 211938211 in words is "two hundred eleven million, nine hundred thirty-eight thousand, two hundred eleven".