1221100110209 has 8 divisors (see below), whose sum is σ = 1395552393600. Its totient is φ = 1046650179456.

The previous prime is 1221100110203. The next prime is 1221100110211. The reversal of 1221100110209 is 9020110011221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1221100110209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221100110203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717212 + ... + 1719474.

It is an arithmetic number, because the mean of its divisors is an integer number (174444049200).

Almost surely, 2^{1221100110209} is an apocalyptic number.

It is an amenable number.

1221100110209 is a deficient number, since it is larger than the sum of its proper divisors (174452283391).

1221100110209 is a wasteful number, since it uses less digits than its factorization.

1221100110209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176319.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1221100110209 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred ten thousand, two hundred nine".