1221101120011 has 2 divisors, whose sum is σ = 1221101120012. Its totient is φ = 1221101120010.

The previous prime is 1221101119961. The next prime is 1221101120047. The reversal of 1221101120011 is 1100211011221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221101120011 - 2⁹ = 1221101119499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221101119973 and 1221101120000.

It is not a weakly prime, because it can be changed into another prime (1221101120051) 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, 610550560005 + 610550560006.

It is an arithmetic number, because the mean of its divisors is an integer number (610550560006).

Almost surely, 2^{1221101120011} is an apocalyptic number.

1221101120011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221101120011 is an equidigital number, since it uses as much as digits as its factorization.

1221101120011 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 13.

Adding to 1221101120011 its reverse (1100211011221), we get a palindrome (2321312131232).

The spelling of 1221101120011 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty thousand, eleven".