211123387 has 2 divisors, whose sum is σ = 211123388. Its totient is φ = 211123386.

The previous prime is 211123349. The next prime is 211123411. The reversal of 211123387 is 783321112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211123387 is a prime.

It is not a weakly prime, because it can be changed into another prime (211123337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561693 + 105561694.

It is an arithmetic number, because the mean of its divisors is an integer number (105561694).

Almost surely, 2^211123387 is an apocalyptic number.

211123387 is a deficient number, since it is larger than the sum of its proper divisors (1).

211123387 is an equidigital number, since it uses as much as digits as its factorization.

211123387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 211123387 is about 14530.0855813034. The cubic root of 211123387 is about 595.4502037228.

Adding to 211123387 its reverse (783321112), we get a palindrome (994444499).

The spelling of 211123387 in words is "two hundred eleven million, one hundred twenty-three thousand, three hundred eighty-seven".