1211011211 has 2 divisors, whose sum is σ = 1211011212. Its totient is φ = 1211011210.

The previous prime is 1211011199. The next prime is 1211011237. The reversal of 1211011211 is 1121101121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211011211 - 2¹⁰ = 1211010187 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211011192 and 1211011201.

It is not a weakly prime, because it can be changed into another prime (1211011511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605505605 + 605505606.

It is an arithmetic number, because the mean of its divisors is an integer number (605505606).

Almost surely, 2^1211011211 is an apocalyptic number.

1211011211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211011211 is an equidigital number, since it uses as much as digits as its factorization.

1211011211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1211011211 is about 34799.5863624843. The cubic root of 1211011211 is about 1065.8989994855.

Adding to 1211011211 its reverse (1121101121), we get a palindrome (2332112332).

The spelling of 1211011211 in words is "one billion, two hundred eleven million, eleven thousand, two hundred eleven".