12011220111 has 16 divisors (see below), whose sum is σ = 17473223808. Its totient is φ = 7278544800.

The previous prime is 12011220107. The next prime is 12011220157. The reversal of 12011220111 is 11102211021.

It is not a de Polignac number, because 12011220111 - 2² = 12011220107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011220161) 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, 279985 + ... + 320021.

It is an arithmetic number, because the mean of its divisors is an integer number (1092076488).

Almost surely, 2^12011220111 is an apocalyptic number.

12011220111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12011220111 is a deficient number, since it is larger than the sum of its proper divisors (5462003697).

12011220111 is a wasteful number, since it uses less digits than its factorization.

12011220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49142.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12011220111 its reverse (11102211021), we get a palindrome (23113431132).

The spelling of 12011220111 in words is "twelve billion, eleven million, two hundred twenty thousand, one hundred eleven".