211021873 has 2 divisors, whose sum is σ = 211021874. Its totient is φ = 211021872.

The previous prime is 211021871. The next prime is 211021879. The reversal of 211021873 is 378120112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185286544 + 25735329 = 13612^2 + 5073^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021873 - 2¹ = 211021871 is a prime.

Together with 211021871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211021871) 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, 105510936 + 105510937.

It is an arithmetic number, because the mean of its divisors is an integer number (105510937).

Almost surely, 2^211021873 is an apocalyptic number.

It is an amenable number.

211021873 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021873 is an equidigital number, since it uses as much as digits as its factorization.

211021873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 211021873 is about 14526.5919265325. The cubic root of 211021873 is about 595.3547520795.

Adding to 211021873 its reverse (378120112), we get a palindrome (589141985).

The spelling of 211021873 in words is "two hundred eleven million, twenty-one thousand, eight hundred seventy-three".