1212120011 has 2 divisors, whose sum is σ = 1212120012. Its totient is φ = 1212120010.

The previous prime is 1212119999. The next prime is 1212120053. The reversal of 1212120011 is 1100212121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212120011 - 2⁶ = 1212119947 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212119974 and 1212120001.

It is not a weakly prime, because it can be changed into another prime (1212120071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606060005 + 606060006.

It is an arithmetic number, because the mean of its divisors is an integer number (606060006).

Almost surely, 2^1212120011 is an apocalyptic number.

1212120011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212120011 is an equidigital number, since it uses as much as digits as its factorization.

1212120011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1212120011 is about 34815.5139413452. The cubic root of 1212120011 is about 1066.2242120785.

Adding to 1212120011 its reverse (1100212121), we get a palindrome (2312332132).

The spelling of 1212120011 in words is "one billion, two hundred twelve million, one hundred twenty thousand, eleven".