1221344040011 has 2 divisors, whose sum is σ = 1221344040012. Its totient is φ = 1221344040010.

The previous prime is 1221344039933. The next prime is 1221344040061. The reversal of 1221344040011 is 1100404431221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221344040011 - 2³⁰ = 1220270298187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221344040061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610672020005 + 610672020006.

It is an arithmetic number, because the mean of its divisors is an integer number (610672020006).

Almost surely, 2^{1221344040011} is an apocalyptic number.

1221344040011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221344040011 is an equidigital number, since it uses as much as digits as its factorization.

1221344040011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1221344040011 its reverse (1100404431221), we get a palindrome (2321748471232).

The spelling of 1221344040011 in words is "one trillion, two hundred twenty-one billion, three hundred forty-four million, forty thousand, eleven".