11121320111 has 16 divisors (see below), whose sum is σ = 12672903168. Its totient is φ = 9660736800.

The previous prime is 11121320101. The next prime is 11121320129. The reversal of 11121320111 is 11102312111.

It is not a de Polignac number, because 11121320111 - 2⁶ = 11121320047 is a prime.

It is a super-2 number, since 2×11121320111² (a number of 21 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 (11121320101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228545 + ... + 272901.

It is an arithmetic number, because the mean of its divisors is an integer number (792056448).

Almost surely, 2^11121320111 is an apocalyptic number.

11121320111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11121320111 is a deficient number, since it is larger than the sum of its proper divisors (1551583057).

11121320111 is a wasteful number, since it uses less digits than its factorization.

11121320111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45382.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 11121320111 its reverse (11102312111), we get a palindrome (22223632222).

The spelling of 11121320111 in words is "eleven billion, one hundred twenty-one million, three hundred twenty thousand, one hundred eleven".