211684973 has 2 divisors, whose sum is σ = 211684974. Its totient is φ = 211684972.

The previous prime is 211684961. The next prime is 211684981. The reversal of 211684973 is 379486112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187498249 + 24186724 = 13693^2 + 4918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211684973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211684973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211684373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105842486 + 105842487.

It is an arithmetic number, because the mean of its divisors is an integer number (105842487).

Almost surely, 2^211684973 is an apocalyptic number.

It is an amenable number.

211684973 is a deficient number, since it is larger than the sum of its proper divisors (1).

211684973 is an equidigital number, since it uses as much as digits as its factorization.

211684973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 211684973 is about 14549.3976851277. The cubic root of 211684973 is about 595.9777000575.

The spelling of 211684973 in words is "two hundred eleven million, six hundred eighty-four thousand, nine hundred seventy-three".