211720199 has 2 divisors, whose sum is σ = 211720200. Its totient is φ = 211720198.

The previous prime is 211720181. The next prime is 211720217. The reversal of 211720199 is 991027112.

It is a balanced prime because it is at equal distance from previous prime (211720181) and next prime (211720217).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211720199 is a prime.

It is a super-3 number, since 3×211720199³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211720169) 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, 105860099 + 105860100.

It is an arithmetic number, because the mean of its divisors is an integer number (105860100).

Almost surely, 2^211720199 is an apocalyptic number.

211720199 is a deficient number, since it is larger than the sum of its proper divisors (1).

211720199 is an equidigital number, since it uses as much as digits as its factorization.

211720199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 211720199 is about 14550.6082003468. The cubic root of 211720199 is about 596.0107566411.

The spelling of 211720199 in words is "two hundred eleven million, seven hundred twenty thousand, one hundred ninety-nine".