211111227461 has 2 divisors, whose sum is σ = 211111227462. Its totient is φ = 211111227460.

The previous prime is 211111227409. The next prime is 211111227491. The reversal of 211111227461 is 164722111112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181940637025 + 29170590436 = 426545^2 + 170794^2 .

It is a cyclic number.

It is not a de Polignac number, because 211111227461 - 2¹⁰ = 211111226437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211111227491) 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, 105555613730 + 105555613731.

It is an arithmetic number, because the mean of its divisors is an integer number (105555613731).

Almost surely, 2^211111227461 is an apocalyptic number.

It is an amenable number.

211111227461 is a deficient number, since it is larger than the sum of its proper divisors (1).

211111227461 is an equidigital number, since it uses as much as digits as its factorization.

211111227461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 29.

Adding to 211111227461 its reverse (164722111112), we get a palindrome (375833338573).

The spelling of 211111227461 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty-seven thousand, four hundred sixty-one".