1100121811 has 2 divisors, whose sum is σ = 1100121812. Its totient is φ = 1100121810.

The previous prime is 1100121787. The next prime is 1100121821. The reversal of 1100121811 is 1181210011.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1100121811 - 2⁵ = 1100121779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1100121821) 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, 550060905 + 550060906.

It is an arithmetic number, because the mean of its divisors is an integer number (550060906).

Almost surely, 2^1100121811 is an apocalyptic number.

1100121811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100121811 is an equidigital number, since it uses as much as digits as its factorization.

1100121811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 16.

The square root of 1100121811 is about 33168.0842226379. The cubic root of 1100121811 is about 1032.3182180115.

Adding to 1100121811 its reverse (1181210011), we get a palindrome (2281331822).

The spelling of 1100121811 in words is "one billion, one hundred million, one hundred twenty-one thousand, eight hundred eleven".