211921849 has 2 divisors, whose sum is σ = 211921850. Its totient is φ = 211921848.

The previous prime is 211921841. The next prime is 211921861. The reversal of 211921849 is 948129112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210250000 + 1671849 = 14500^2 + 1293^2 .

It is a cyclic number.

It is not a de Polignac number, because 211921849 - 2³ = 211921841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211921841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105960924 + 105960925.

It is an arithmetic number, because the mean of its divisors is an integer number (105960925).

Almost surely, 2^211921849 is an apocalyptic number.

It is an amenable number.

211921849 is a deficient number, since it is larger than the sum of its proper divisors (1).

211921849 is an equidigital number, since it uses as much as digits as its factorization.

211921849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 37.

The square root of 211921849 is about 14557.5358148280. The cubic root of 211921849 is about 596.1999173565.

The spelling of 211921849 in words is "two hundred eleven million, nine hundred twenty-one thousand, eight hundred forty-nine".