1221101220009 has 16 divisors (see below), whose sum is σ = 1837393686720. Its totient is φ = 714541988160.

The previous prime is 1221101219999. The next prime is 1221101220011. The reversal of 1221101220009 is 9000221011221.

It is not a de Polignac number, because 1221101220009 - 2⁵ = 1221101219977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221101220089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637982962 + ... + 637984875.

It is an arithmetic number, because the mean of its divisors is an integer number (114837105420).

Almost surely, 2^{1221101220009} is an apocalyptic number.

It is an amenable number.

1221101220009 is a deficient number, since it is larger than the sum of its proper divisors (616292466711).

1221101220009 is a wasteful number, since it uses less digits than its factorization.

1221101220009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275967880.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 1221101220009 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, nine".