211111111061 has 2 divisors, whose sum is σ = 211111111062. Its totient is φ = 211111111060.

The previous prime is 211111111039. The next prime is 211111111091. The reversal of 211111111061 is 160111111112.

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., 190712130436 + 20398980625 = 436706^2 + 142825^2 .

It is a cyclic number.

It is not a de Polignac number, because 211111111061 - 2¹⁸ = 211110848917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211111111091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555555530 + 105555555531.

It is an arithmetic number, because the mean of its divisors is an integer number (105555555531).

Almost surely, 2^211111111061 is an apocalyptic number.

It is an amenable number.

211111111061 is a deficient number, since it is larger than the sum of its proper divisors (1).

211111111061 is an equidigital number, since it uses as much as digits as its factorization.

211111111061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 211111111061 its reverse (160111111112), we get a palindrome (371222222173).

The spelling of 211111111061 in words is "two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, sixty-one".