11212111111 has 8 divisors (see below), whose sum is σ = 11234386800. Its totient is φ = 11189855040.

The previous prime is 11212111087. The next prime is 11212111123. The reversal of 11212111111 is 11111121211.

11212111111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11212111111 - 2²¹ = 11210013959 is a prime.

It is a super-2 number, since 2×11212111111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

11212111111 is a modest number, since divided by 111111 gives 11212 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 11212111091 and 11212111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212118111) 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 7 ways as a sum of consecutive naturals, for example, 1654971 + ... + 1661731.

It is an arithmetic number, because the mean of its divisors is an integer number (1404298350).

Almost surely, 2^11212111111 is an apocalyptic number.

11212111111 is a deficient number, since it is larger than the sum of its proper divisors (22275689).

11212111111 is an equidigital number, since it uses as much as digits as its factorization.

11212111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9809.

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

Adding to 11212111111 its reverse (11111121211), we get a palindrome (22323232322).

It can be divided in two parts, 1121211 and 1111, that multiplied together give a palindrome (1245665421).

The spelling of 11212111111 in words is "eleven billion, two hundred twelve million, one hundred eleven thousand, one hundred eleven".