11133221111 has 4 divisors (see below), whose sum is σ = 11135224392. Its totient is φ = 11131217832.

The previous prime is 11133221089. The next prime is 11133221149. The reversal of 11133221111 is 11112233111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11112233111 = 7 ⋅1587461873.

It is a cyclic number.

It is not a de Polignac number, because 11133221111 - 2¹⁴ = 11133204727 is a prime.

It is a super-2 number, since 2×11133221111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 11133221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11133221311) 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, 993281 + ... + 1004426.

It is an arithmetic number, because the mean of its divisors is an integer number (2783806098).

Almost surely, 2^11133221111 is an apocalyptic number.

11133221111 is a deficient number, since it is larger than the sum of its proper divisors (2003281).

11133221111 is an equidigital number, since it uses as much as digits as its factorization.

11133221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003280.

The product of its digits is 36, while the sum is 17.

Adding to 11133221111 its reverse (11112233111), we get a palindrome (22245454222).

The spelling of 11133221111 in words is "eleven billion, one hundred thirty-three million, two hundred twenty-one thousand, one hundred eleven".