211019993 has 2 divisors, whose sum is σ = 211019994. Its totient is φ = 211019992.

The previous prime is 211019983. The next prime is 211020001. The reversal of 211019993 is 399910112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191905609 + 19114384 = 13853^2 + 4372^2 .

It is a cyclic number.

It is not a de Polignac number, because 211019993 - 2⁸ = 211019737 is a prime.

It is not a weakly prime, because it can be changed into another prime (211019983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105509996 + 105509997.

It is an arithmetic number, because the mean of its divisors is an integer number (105509997).

Almost surely, 2^211019993 is an apocalyptic number.

It is an amenable number.

211019993 is a deficient number, since it is larger than the sum of its proper divisors (1).

211019993 is an equidigital number, since it uses as much as digits as its factorization.

211019993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 211019993 is about 14526.5272174736. The cubic root of 211019993 is about 595.3529840633.

The spelling of 211019993 in words is "two hundred eleven million, nineteen thousand, nine hundred ninety-three".