12111220221111 has 48 divisors (see below), whose sum is σ = 19812361470720. Its totient is φ = 7251696899280.

The previous prime is 12111220221049. The next prime is 12111220221119. The reversal of 12111220221111 is 11112202211121.

It is a happy number.

12111220221111 is a `hidden beast` number, since 1 + 2 + 111 + 220 + 221 + 111 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-12111220221111 is a prime.

It is a super-4 number, since 4×12111220221111⁴ (a number of 53 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111220221119) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 913651 + ... + 5005716.

It is an arithmetic number, because the mean of its divisors is an integer number (412757530640).

Almost surely, 2^{12111220221111} is an apocalyptic number.

12111220221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12111220221111 is a deficient number, since it is larger than the sum of its proper divisors (7701141249609).

12111220221111 is an equidigital number, since it uses as much as digits as its factorization.

12111220221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5919553 (or 5919464 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12111220221111 its reverse (11112202211121), we get a palindrome (23223422432232).

It can be divided in two parts, 1 and 2111220221111, that added together give a palindrome (2111220221112).

The spelling of 12111220221111 in words is "twelve trillion, one hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, one hundred eleven".