211211111623481 has 2 divisors, whose sum is σ = 211211111623482. Its totient is φ = 211211111623480.

The previous prime is 211211111623471. The next prime is 211211111623507. The reversal of 211211111623481 is 184326111112112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192724250490256 + 18486861133225 = 13882516^2 + 4299635^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211111623481 - 2⁶ = 211211111623417 is a prime.

It is a super-2 number, since 2×211211111623481² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211211111623471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605555811740 + 105605555811741.

It is an arithmetic number, because the mean of its divisors is an integer number (105605555811741).

Almost surely, 2^{211211111623481} is an apocalyptic number.

It is an amenable number.

211211111623481 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211111623481 is an equidigital number, since it uses as much as digits as its factorization.

211211111623481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 35.

Adding to 211211111623481 its reverse (184326111112112), we get a palindrome (395537222735593).

The spelling of 211211111623481 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred eleven million, six hundred twenty-three thousand, four hundred eighty-one".