11100111011221 has 4 divisors (see below), whose sum is σ = 11582724533472. Its totient is φ = 10617497488972.

The previous prime is 11100111011203. The next prime is 11100111011237. The reversal of 11100111011221 is 12211011100111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11100111011221 - 2¹¹ = 11100111009173 is a prime.

It is a super-2 number, since 2×11100111011221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100111011251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241306761091 + ... + 241306761136.

It is an arithmetic number, because the mean of its divisors is an integer number (2895681133368).

Almost surely, 2^{11100111011221} is an apocalyptic number.

It is an amenable number.

11100111011221 is a deficient number, since it is larger than the sum of its proper divisors (482613522251).

11100111011221 is an equidigital number, since it uses as much as digits as its factorization.

11100111011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482613522250.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11100111011221 its reverse (12211011100111), we get a palindrome (23311122111332).

The spelling of 11100111011221 in words is "eleven trillion, one hundred billion, one hundred eleven million, eleven thousand, two hundred twenty-one".