1221111110009 has 16 divisors (see below), whose sum is σ = 1425358591488. Its totient is φ = 1024317837312.

The previous prime is 1221111110003. The next prime is 1221111110027. The reversal of 1221111110009 is 9000111111221.

It is not a de Polignac number, because 1221111110009 - 2⁸ = 1221111109753 is a prime.

It is a super-2 number, since 2×1221111110009² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221111110003) 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 in 15 ways as a sum of consecutive naturals, for example, 4322009 + ... + 4595865.

It is an arithmetic number, because the mean of its divisors is an integer number (89084911968).

Almost surely, 2^{1221111110009} is an apocalyptic number.

It is an amenable number.

1221111110009 is a deficient number, since it is larger than the sum of its proper divisors (204247481479).

1221111110009 is a wasteful number, since it uses less digits than its factorization.

1221111110009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287464.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 1221111110009 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, nine".