1221222100209 has 16 divisors (see below), whose sum is σ = 1634809937088. Its totient is φ = 810897227712.

The previous prime is 1221222100093. The next prime is 1221222100243. The reversal of 1221222100209 is 9020012221221.

It is a de Polignac number, because none of the positive numbers 2^k-1221222100209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221222108209) 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 in 15 ways as a sum of consecutive naturals, for example, 49014 + ... + 1563600.

It is an arithmetic number, because the mean of its divisors is an integer number (102175621068).

Almost surely, 2^{1221222100209} is an apocalyptic number.

It is an amenable number.

1221222100209 is a deficient number, since it is larger than the sum of its proper divisors (413587836879).

1221222100209 is a wasteful number, since it uses less digits than its factorization.

1221222100209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515664.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 1221222100209 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, two hundred nine".