211312823 has 2 divisors, whose sum is σ = 211312824. Its totient is φ = 211312822.

The previous prime is 211312819. The next prime is 211312831. The reversal of 211312823 is 328213112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211312823 - 2² = 211312819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211312223) 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, 105656411 + 105656412.

It is an arithmetic number, because the mean of its divisors is an integer number (105656412).

Almost surely, 2^211312823 is an apocalyptic number.

211312823 is a deficient number, since it is larger than the sum of its proper divisors (1).

211312823 is an equidigital number, since it uses as much as digits as its factorization.

211312823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 211312823 is about 14536.6028699968. The cubic root of 211312823 is about 595.6282449237.

Adding to 211312823 its reverse (328213112), we get a palindrome (539525935).

The spelling of 211312823 in words is "two hundred eleven million, three hundred twelve thousand, eight hundred twenty-three".