11100001221 has 36 divisors (see below), whose sum is σ = 16582474272. Its totient is φ = 7154534304.

The previous prime is 11100001219. The next prime is 11100001243. The reversal of 11100001221 is 12210000111.

It is a happy number.

11100001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11100001221 - 2¹ = 11100001219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

11100001221 is a modest number, since divided by 1221 gives 111 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100006221) 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 35 ways as a sum of consecutive naturals, for example, 2005560 + ... + 2011086.

Almost surely, 2^11100001221 is an apocalyptic number.

It is an amenable number.

11100001221 is a deficient number, since it is larger than the sum of its proper divisors (5482473051).

11100001221 is a wasteful number, since it uses less digits than its factorization.

11100001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5770 (or 5730 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11100001221 its reverse (12210000111), we get a palindrome (23310001332).

The spelling of 11100001221 in words is "eleven billion, one hundred million, one thousand, two hundred twenty-one".