11100020001221 has 4 divisors (see below), whose sum is σ = 11752962354252. Its totient is φ = 10447077648192.

The previous prime is 11100020001197. The next prime is 11100020001227. The reversal of 11100020001221 is 12210002000111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4733935929121 + 6366084072100 = 2175761^2 + 2523110^2 .

It is a cyclic number.

It is not a de Polignac number, because 11100020001221 - 2¹⁰ = 11100020000197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100020001227) 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 3 ways as a sum of consecutive naturals, for example, 326471176490 + ... + 326471176523.

It is an arithmetic number, because the mean of its divisors is an integer number (2938240588563).

Almost surely, 2^{11100020001221} is an apocalyptic number.

It is an amenable number.

11100020001221 is a deficient number, since it is larger than the sum of its proper divisors (652942353031).

11100020001221 is an equidigital number, since it uses as much as digits as its factorization.

11100020001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652942353030.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11100020001221 its reverse (12210002000111), we get a palindrome (23310022001332).

The spelling of 11100020001221 in words is "eleven trillion, one hundred billion, twenty million, one thousand, two hundred twenty-one".