211043993 has 2 divisors, whose sum is σ = 211043994. Its totient is φ = 211043992.

The previous prime is 211043983. The next prime is 211043999. The reversal of 211043993 is 399340112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162001984 + 49042009 = 12728^2 + 7003^2 .

It is a cyclic number.

It is not a de Polignac number, because 211043993 - 2¹⁶ = 210978457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211043999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105521996 + 105521997.

It is an arithmetic number, because the mean of its divisors is an integer number (105521997).

Almost surely, 2^211043993 is an apocalyptic number.

It is an amenable number.

211043993 is a deficient number, since it is larger than the sum of its proper divisors (1).

211043993 is an equidigital number, since it uses as much as digits as its factorization.

211043993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 211043993 is about 14527.3532689200. The cubic root of 211043993 is about 595.3755536940.

The spelling of 211043993 in words is "two hundred eleven million, forty-three thousand, nine hundred ninety-three".