1221101219999 has 2 divisors, whose sum is σ = 1221101220000. Its totient is φ = 1221101219998.

The previous prime is 1221101219977. The next prime is 1221101220011. The reversal of 1221101219999 is 9999121011221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221101219999 - 2¹⁶ = 1221101154463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221101210999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550609999 + 610550610000.

It is an arithmetic number, because the mean of its divisors is an integer number (610550610000).

Almost surely, 2^{1221101219999} is an apocalyptic number.

1221101219999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221101219999 is an equidigital number, since it uses as much as digits as its factorization.

1221101219999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 1221101219999 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred nineteen thousand, nine hundred ninety-nine".