1100001221221 has 16 divisors (see below), whose sum is σ = 1269421590528. Its totient is φ = 933651226800.

The previous prime is 1100001221177. The next prime is 1100001221257. The reversal of 1100001221221 is 1221221000011.

It is a cyclic number.

It is not a de Polignac number, because 1100001221221 - 2¹⁵ = 1100001188453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100001224221) 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 15 ways as a sum of consecutive naturals, for example, 17713536 + ... + 17775526.

It is an arithmetic number, because the mean of its divisors is an integer number (79338849408).

Almost surely, 2^{1100001221221} is an apocalyptic number.

It is an amenable number.

1100001221221 is a deficient number, since it is larger than the sum of its proper divisors (169420369307).

1100001221221 is a wasteful number, since it uses less digits than its factorization.

1100001221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86712.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1100001221221 its reverse (1221221000011), we get a palindrome (2321222221232).

The spelling of 1100001221221 in words is "one trillion, one hundred billion, one million, two hundred twenty-one thousand, two hundred twenty-one".