12011221101 has 32 divisors (see below), whose sum is σ = 17744284800. Its totient is φ = 7166465280.

The previous prime is 12011221097. The next prime is 12011221109. The reversal of 12011221101 is 10112211021.

It is not a de Polignac number, because 12011221101 - 2² = 12011221097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011221109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 554095 + ... + 575363.

It is an arithmetic number, because the mean of its divisors is an integer number (554508900).

Almost surely, 2^12011221101 is an apocalyptic number.

12011221101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12011221101 is a deficient number, since it is larger than the sum of its proper divisors (5733063699).

12011221101 is a wasteful number, since it uses less digits than its factorization.

12011221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21549.

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

Adding to 12011221101 its reverse (10112211021), we get a palindrome (22123432122).

It can be divided in two parts, 1 and 2011221101, that added together give a palindrome (2011221102).

The spelling of 12011221101 in words is "twelve billion, eleven million, two hundred twenty-one thousand, one hundred one".