1221093510911 has 2 divisors, whose sum is σ = 1221093510912. Its totient is φ = 1221093510910.

The previous prime is 1221093510883. The next prime is 1221093510929. The reversal of 1221093510911 is 1190153901221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221093510911 - 2²² = 1221089316607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221093510311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610546755455 + 610546755456.

It is an arithmetic number, because the mean of its divisors is an integer number (610546755456).

Almost surely, 2^{1221093510911} is an apocalyptic number.

1221093510911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221093510911 is an equidigital number, since it uses as much as digits as its factorization.

1221093510911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 35.

The spelling of 1221093510911 in words is "one trillion, two hundred twenty-one billion, ninety-three million, five hundred ten thousand, nine hundred eleven".